100 Free Online Courses

Online Courses
Multiple Location
September 12, 2026

Online learning is a simple way to build new skills from home. Many universities and trusted education platforms provide free online courses in technology, business, English, science, health, mathematics, and other subjects. Some courses allow free learning but may charge for a verified certificate. The list below includes 100 useful courses from official education websites. You can choose a course, open the official page, and start learning online.

1. CS50’s Introduction to Computer Science

Course topics:

Computer science basics
C programming
Python
SQL
Web development

Conditions:

No previous CS study needed
Online study
Free course access

Official registration: Harvard CS50 course

2. CS50’s Introduction to Programming with Python

Course topics:

Python basics
Functions
Loops
Data structures
Web programming

Conditions:

Beginners welcome
Basic computer skills
Online study

Official registration: Harvard CS50P

3. CS50’s Introduction to Artificial Intelligence with Python

Course topics:

AI basics
Search
Machine learning
Neural networks
Language processing

Conditions:

Python knowledge recommended
Online learning
Free course access

Official registration: Harvard CS50 AI

4. CS50’s Web Programming with Python and JavaScript

Course topics:

HTML and CSS
Python
JavaScript
SQL
Web applications

Conditions:

Basic programming helpful
Online study
Free course access

Official registration: Harvard CS50 Web

5. CS50’s Introduction to Game Development

Course topics:

Game design
Lua
2D games
3D games
Game engines

Conditions:

Basic programming helpful
Computer required
Online learning

Official registration: Harvard CS50 Games

6. CS50’s Understanding Technology

Course topics:

Computer hardware
Internet
Security
Software
Technology basics

Conditions:

No technical background needed
Beginner friendly
Online study

Official registration: Harvard CS50 Understanding Technology

7. CS50’s Introduction to Cybersecurity

Course topics:

Cybersecurity
Passwords
Privacy
Network security
Online threats

Conditions:

Beginners welcome
Basic computer use
Online study

Official registration: Harvard CS50 Cybersecurity

8. CS50’s Introduction to Databases with SQL

Course topics:

SQL
Databases
Tables
Queries
Data management

Conditions:

Beginner friendly
Basic computer skills
Online learning

Official registration: Harvard CS50 SQL

9. CS50’s Introduction to Computer Science – 2026

Course topics:

Scratch
C
Algorithms
Python
SQL
HTML

Conditions:

No prior CS degree
Online learning
Free access

Harvard states that learners can take CS50 online for free through its OpenCourseWare materials.

Official registration: Start CS50

10. CS50’s Introduction to Programming with R

Course topics:

R programming
Data analysis
Functions
Statistics
Data visualization

Conditions:

Beginner friendly
Computer required
Online study

Official registration: Harvard CS50 R

11. Introduction to Cyber Security: Stay Safe Online

Course topics:

Online safety
Malware
Network security
Identity theft
Digital protection

Conditions:

Beginner level
Online study
Free OpenLearn account for progress

OpenLearn lists this as a free introductory course and offers a free statement of participation and digital badge.

Official registration: OpenLearn Cyber Security

12. Business Communication: Writing a SWOT Analysis

Course topics:

SWOT analysis
Business writing
Case studies
Reports
Recommendations

Conditions:

Beginner level
English reading
Online study

The course is designed to improve business writing and teach learners how to prepare a clear SWOT analysis.

Official registration: OpenLearn SWOT course

13. Start Writing Fiction

Course topics:

Characters
Story ideas
Setting
Fiction genres
Writing practice

Conditions:

Beginner friendly
Interest in writing
Online study

OpenLearn says the course focuses on characters, settings, genre, and fiction writing.

Official registration: OpenLearn Fiction Course

14. Ratio, Proportion and Percentages

Course topics:

Ratios
Percentages
Proportions
Everyday mathematics
Calculations

Conditions:

Beginner level
Basic mathematics helpful
Online study

Official registration: OpenLearn Mathematics

15. Introduction to Spanish

Course topics:

Basic Spanish
Work vocabulary
Daily activities
Grammar
Pronunciation

Conditions:

Beginners welcome
No Spanish degree needed
Online study

The course includes interactive activities and basic Spanish vocabulary and grammar.

Official registration: OpenLearn Spanish

16. Getting Started with Spanish 1

Course topics:

Greetings
Pronunciation
Basic words
Communication
Spanish culture

Conditions:

Beginner level
Online study
Free account

Official registration: Start Spanish 1

17. Beginners’ Chinese: A Taster Course

Course topics:

Mandarin sounds
Pinyin
Chinese characters
Basic vocabulary
Greetings

Conditions:

Beginner level
No Chinese required
Online study

OpenLearn describes this as a free introductory course covering Pinyin, tones, characters, vocabulary, and basic communication.

Official registration: OpenLearn Chinese Course

18. Working in Teams

Course topics:

Team roles
Teamwork
Communication
Workplace skills
Personal strengths

Conditions:

Beginner friendly
Online study
Free OpenLearn account

Official registration: OpenLearn Working in Teams

19. Lottery of Birth

Course topics:

Poverty
Inequality
Health
Education
Social mobility

Conditions:

Beginner level
Online study
Free access

OpenLearn lists the course as a free introductory course covering inequality, poverty, education, health, and social mobility.

Official registration: OpenLearn Lottery of Birth

20. Reading and Note Taking – Preparation for Study

Course topics:

Reading skills
Note taking
Summaries
Key ideas
Referencing

Conditions:

Beginner level
Useful for students
Online study

OpenLearn covers active reading, note taking, summarising, and using information in your own words.

Official registration: OpenLearn Study Skills

21. Project Management: The Start of the Project Journey

Course topics:

Project planning
Feasibility
Project life cycle
Decision making
Project management

Conditions:

Beginner level
Online study
Free access

Official registration: OpenLearn Project Management

22. Introduction to Artificial Intelligence

Course topics:

AI history
AI society
Ethics
Technology
Social impact

Conditions:

Beginner level
No coding required
Online study

Official registration: OpenLearn AI Course

23. AI Fluency

Course topics:

AI basics
Generative AI
AI tools
Ethics
Privacy

Conditions:

Beginner friendly
No advanced coding
Online study

OpenLearn describes AI Fluency as a beginner course covering AI, generative AI, responsible use, accessibility, and social impact.

Official registration: OpenLearn AI Fluency

24. Building Motivation and Resilience in Research

Course topics:

Research motivation
Resilience
Setbacks
Stress
Growth mindset

Conditions:

Intermediate level
Useful for researchers
Online study

OpenLearn says this course helps learners handle research setbacks, improve motivation, and build a personal resilience plan.

Official registration: OpenLearn Research Course

25. Diversity and Inclusion in the Workplace

Course topics:

Diversity
Inclusion
Workplace culture
Equality
Teamwork

Conditions:

Beginner friendly
Online study
Free access

Official registration: OpenLearn Diversity Course

26. Understanding Depression and Anxiety

Course topics:

Stress
Anxiety
Depression
Biology
Psychology

Conditions:

Intermediate level
Online study
Educational use

OpenLearn describes this as a free course about stress and factors linked with depression and anxiety.

Official registration: OpenLearn Mental Health Course

27. Children’s Wellbeing and Creativity

Course topics:

Child wellbeing
Creativity
Arts
Online gaming
Activities

Conditions:

Intermediate level
Online study
Education interest useful

Official registration: OpenLearn Children’s Wellbeing

28. Studying Mammals: Plant Predators

Course topics:

Mammals
Herbivores
Plant nutrition
Animal biology
Adaptation

Conditions:

Beginner level
Biology interest
Online study

Official registration: OpenLearn Mammals Course

29. Coaching Neurodivergent Athletes

Course topics:

Neurodiversity
Sports coaching
Athlete needs
Inclusion
Coaching methods

Conditions:

Beginner level
Sports interest
Online study

Official registration: OpenLearn Coaching Course

30. Social Problems: Who Makes Them?

Course topics:

Social problems
Poverty
Society
Social policy
Social change

Conditions:

Intermediate level
Online study
Interest in society

Official registration: OpenLearn Social Problems

31. MIT Introduction to Computer Science and Programming in Python

Course topics:

Python
Algorithms
Programming
Problem solving
Computation

Conditions:

Beginner friendly
Computer recommended
Self-study

MIT OpenCourseWare is free and does not require registration or enrollment.

Official course: MIT Python Course

32. MIT Introduction to Computational Thinking and Data Science

Course topics:

Python
Data
Statistics
Models
Algorithms

Conditions:

Python helpful
Self-study
Free materials

Official course: MIT Data Science

33. MIT Introduction to Algorithms

Course topics:

Algorithms
Data structures
Searching
Sorting
Graphs

Conditions:

Programming knowledge useful
Self-study
Free access

Official course: MIT Algorithms

34. MIT Mathematics for Computer Science

Course topics:

Logic
Proofs
Graphs
Probability
Algorithms

Conditions:

Mathematics helpful
Self-study
Free access

Official course: MIT Mathematics for CS

35. MIT Linear Algebra

Course topics:

Matrices
Vectors
Linear equations
Eigenvalues
Applications

Conditions:

Basic mathematics
Self-study
Free materials

Official course: MIT Linear Algebra

36. MIT Single Variable Calculus

Course topics:

Limits
Derivatives
Integrals
Functions
Applications

Conditions:

Basic algebra
Mathematics interest
Self-study

Official course: MIT Calculus

37. MIT Multivariable Calculus

Course topics:

Vectors
Derivatives
Integrals
Geometry
Applications

Conditions:

Calculus basics
Self-study
Free access

Official course: MIT Multivariable Calculus

38. MIT Classical Mechanics

Course topics:

Motion
Forces
Energy
Momentum
Mechanics

Conditions:

Physics basics useful
Self-study
Free materials

Official course: MIT Classical Mechanics

39. MIT Electricity and Magnetism

Course topics:

Electric fields
Magnetic fields
Circuits
Forces
Energy

Conditions:

Physics basics
Self-study
Free access

Official course: MIT Electricity and Magnetism

40. MIT Introduction to Probability

Course topics:

Probability
Random variables
Statistics
Models
Data

Conditions:

Basic mathematics
Self-study
Free access

Official course: MIT Probability

41. MIT Introduction to Machine Learning

Course topics:

Machine learning
Models
Classification
Prediction
Data

Conditions:

Programming helpful
Mathematics helpful
Self-study

Official course: MIT Machine Learning

42. MIT Deep Learning

Course topics:

Neural networks
Deep learning
Computer vision
Language
AI

Conditions:

Python useful
Mathematics helpful
Self-study

Official course: MIT Deep Learning

43. MIT Computer Networks

Course topics:

Networks
Internet
Protocols
Security
Communication

Conditions:

Computer knowledge useful
Self-study
Free access

Official course: MIT OpenCourseWare Network Courses

44. MIT Operating System Engineering

Course topics:

Operating systems
Kernels
Processes
Memory
File systems

Conditions:

Programming knowledge
Computer science background useful
Self-study

Official course: MIT Operating Systems

45. MIT Database Systems

Course topics:

Databases
SQL
Data models
Storage
Queries

Conditions:

Programming useful
Computer science interest
Self-study

Official course: MIT Database Courses

46. MIT Microeconomic Theory

Course topics:

Demand
Supply
Markets
Consumer choice
Firms

Conditions:

Basic economics useful
Self-study
Free materials

Official course: MIT Microeconomics

47. MIT Macroeconomics

Course topics:

GDP
Inflation
Employment
Economic growth
Policy

Conditions:

Economics interest
Self-study
Free access

Official course: MIT Macroeconomics

48. MIT Game Theory

Course topics:

Games
Strategy
Competition
Decisions
Equilibrium

Conditions:

Basic mathematics useful
Self-study
Free materials

Official course: MIT Game Theory

49. MIT Entrepreneurship

Course topics:

Business ideas
Startups
Innovation
Business models
Strategy

Conditions:

Beginner friendly
Business interest
Self-study

Official course: MIT Entrepreneurship

50. MIT Marketing

Course topics:

Marketing
Customers
Branding
Strategy
Market research

Conditions:

Beginner friendly
Business interest
Self-study

Official course: MIT Marketing Courses

51. Microsoft Learn: Azure Fundamentals

Course topics:

Cloud computing
Azure
Cloud services
Security
Pricing

Conditions:

Beginner friendly
Microsoft account useful
Online study

Microsoft Learn provides self-directed learning through free modules and learning paths.

Official registration: Microsoft Learn Azure

52. Microsoft Learn: Azure AI Fundamentals

Course topics:

AI
Machine learning
Azure AI
Computer vision
Language

Conditions:

Beginner level
Online study
Microsoft account useful

Official registration: Azure AI Training

53. Microsoft Learn: Power BI

Course topics:

Data analysis
Reports
Dashboards
Data models
Visualization

Conditions:

Basic computer skills
Online study
Free learning

Official registration: Microsoft Power BI Training

54. Microsoft Learn: Python for Beginners

Course topics:

Python basics
Variables
Functions
Loops
Programming

Conditions:

Beginner friendly
Computer required
Online study

Official registration: Microsoft Python Training

55. Microsoft Learn: GitHub Fundamentals

Course topics:

Git
GitHub
Repositories
Collaboration
Version control

Conditions:

Beginner friendly
Computer required
Online study

Official registration: Microsoft GitHub Training

56. Microsoft Learn: Introduction to C#

Course topics:

C#
Variables
Methods
Classes
Programming

Conditions:

Beginner level
Computer required
Online study

Official registration: Microsoft C# Training

57. Microsoft Learn: JavaScript

Course topics:

JavaScript
Variables
Functions
Objects
Web development

Conditions:

Beginner friendly
Basic HTML useful
Online study

Official registration: Microsoft JavaScript Training

58. Microsoft Learn: HTML and CSS

Course topics:

HTML
CSS
Web pages
Layout
Styling

Conditions:

Beginner level
Computer required
Online study

Official registration: Microsoft Web Training

59. Microsoft Learn: SQL

Course topics:

SQL
Databases
Queries
Tables
Data

Conditions:

Beginner friendly
Computer recommended
Online study

Official registration: Microsoft SQL Training

60. Microsoft Learn: PowerShell

Course topics:

PowerShell
Commands
Scripts
Automation
Windows

Conditions:

Basic computer skills
Beginner friendly
Online study

Official registration: Microsoft PowerShell Training

61. Microsoft Learn: Cybersecurity

Course topics:

Security
Threats
Identity
Networks
Protection

Conditions:

Beginner friendly
Online study
Microsoft account useful

Official registration: Microsoft Security Training

62. Microsoft Learn: Data Science

Course topics:

Data
Analysis
Machine learning
Statistics
Models

Conditions:

Mathematics useful
Programming useful
Online study

Official registration: Microsoft Data Science Training

63. Microsoft Learn: Machine Learning

Course topics:

Machine learning
Models
Training
Prediction
AI

Conditions:

Python useful
Mathematics useful
Online study

Official registration: Microsoft Machine Learning Training

64. Microsoft Learn: AI Fundamentals

Course topics:

AI
Machine learning
Generative AI
Responsible AI
AI tools

Conditions:

Beginner friendly
No advanced degree
Online study

Official registration: Microsoft AI Training

65. Microsoft Learn: Data Analytics

Course topics:

Data
Analysis
Reports
Visualization
Business data

Conditions:

Beginner friendly
Basic computer skills
Online learning

Official registration: Microsoft Data Analytics

66. HubSpot Academy: Digital Marketing

Course topics:

Digital marketing
Content
SEO
Social media
Email

Conditions:

Beginner friendly
Free account
Online study

Official registration: HubSpot Digital Marketing

67. HubSpot Academy: SEO

Course topics:

SEO
Keywords
Content
Links
Website traffic

Conditions:

Beginner friendly
Free account
Online study

Official registration: HubSpot SEO Course

68. HubSpot Academy: Content Marketing

Course topics:

Content strategy
Blogging
Storytelling
Content planning
Promotion

Conditions:

Beginner level
Free account
Online study

Official registration: HubSpot Content Marketing

69. HubSpot Academy: Social Media Marketing

Course topics:

Social media
Content
Social strategy
Engagement
Measurement

Conditions:

Beginner friendly
Free account
Online study

Official registration: HubSpot Social Media

70. HubSpot Academy: Email Marketing

Course topics:

Email campaigns
Lists
Content
Automation
Measurement

Conditions:

Beginner friendly
Free account
Online study

Official registration: HubSpot Email Marketing

71. HubSpot Academy: Inbound Marketing

Course topics:

Inbound marketing
Content
Customers
Marketing strategy
Growth

Conditions:

Beginner level
Free account
Online study

Official registration: HubSpot Inbound Marketing

72. HubSpot Academy: Sales Training

Course topics:

Sales
Customers
Sales process
Communication
Closing

Conditions:

Beginner friendly
Free account
Online study

Official registration: HubSpot Sales Training

73. HubSpot Academy: Inbound Sales

Course topics:

Prospecting
Sales calls
Leads
Customer needs
Sales process

Conditions:

Beginner level
Free account
Online study

Official registration: HubSpot Inbound Sales

74. HubSpot Academy: CRM Training

Course topics:

CRM basics
Contacts
Deals
Sales records
Customer management

Conditions:

Beginner friendly
Free account
Online study

Official registration: HubSpot CRM Training

75. HubSpot Academy: Service Hub Software

Course topics:

Customer service
Tickets
Help desk
Customer support
CRM

Conditions:

Beginner friendly
Free account
Online study

Official registration: HubSpot Service Course

76. freeCodeCamp: Responsive Web Design

Course topics:

HTML
CSS
Web design
Accessibility
Projects

Conditions:

Beginner friendly
Computer required
Online practice

Official registration: freeCodeCamp Web Design

77. freeCodeCamp: JavaScript Algorithms and Data Structures

Course topics:

JavaScript
Algorithms
Data structures
Functions
Projects

Conditions:

Basic coding helpful
Online practice
Free learning

Official registration: freeCodeCamp JavaScript

78. freeCodeCamp: Front End Development Libraries

Course topics:

React
Bootstrap
jQuery
Front-end tools
Projects

Conditions:

JavaScript useful
Computer required
Online study

Official registration: freeCodeCamp Front End

79. freeCodeCamp: Data Analysis with Python

Course topics:

Python
NumPy
Pandas
Data analysis
Visualization

Conditions:

Python basics helpful
Computer required
Online study

Official registration: freeCodeCamp Data Analysis

80. freeCodeCamp: Machine Learning with Python

Course topics:

Machine learning
Python
Neural networks
Data
Models

Conditions:

Python useful
Mathematics helpful
Online practice

Official registration: freeCodeCamp Machine Learning

81. freeCodeCamp: Scientific Computing with Python

Course topics:

Python
Functions
Data structures
Algorithms
Projects

Conditions:

Beginner to intermediate
Computer required
Online study

Official registration: freeCodeCamp Python

82. freeCodeCamp: Relational Database

Course topics:

Linux
PostgreSQL
SQL
Bash
Databases

Conditions:

Computer required
Basic coding useful
Online study

Official registration: freeCodeCamp Database

83. freeCodeCamp: Back End Development and APIs

Course topics:

Node.js
Express
APIs
JavaScript
Backend

Conditions:

JavaScript useful
Computer required
Online practice

Official registration: freeCodeCamp Backend

84. freeCodeCamp: Quality Assurance

Course topics:

Testing
Node.js
Express
APIs
Software quality

Conditions:

JavaScript helpful
Computer required
Online study

Official registration: freeCodeCamp QA Course

85. freeCodeCamp: Information Security

Course topics:

Security
Node.js
Authentication
Encryption
Web security

Conditions:

Programming useful
Computer required
Online study

Official registration: freeCodeCamp Information Security

86. Khan Academy: Algebra

Course topics:

Equations
Functions
Graphs
Expressions
Problem solving

Conditions:

Beginner friendly
Online study
Free account optional

Official registration: Khan Academy Algebra

87. Khan Academy: Geometry

Course topics:

Shapes
Angles
Proofs
Circles
Geometry

Conditions:

School mathematics
Online study
Free access

Official registration: Khan Academy Geometry

88. Khan Academy: Trigonometry

Course topics:

Angles
Sine
Cosine
Tangent
Trigonometric functions

Conditions:

Algebra helpful
Online study
Free access

Official registration: Khan Academy Trigonometry

89. Khan Academy: Statistics and Probability

Course topics:

Probability
Data
Statistics
Distributions
Sampling

Conditions:

Basic mathematics
Online study
Free access

Official registration: Khan Academy Statistics

90. Khan Academy: Calculus

Course topics:

Limits
Derivatives
Integrals
Functions
Applications

Conditions:

Algebra and trigonometry
Online study
Free access

Official registration: Khan Academy Calculus

91. Khan Academy: Biology

Course topics:

Cells
Genetics
Evolution
Ecology
Human biology

Conditions:

Beginner friendly
Online study
Free access

Official registration: Khan Academy Biology

92. Khan Academy: Chemistry

Course topics:

Atoms
Molecules
Reactions
Chemistry basics
Periodic table

Conditions:

Beginner friendly
Online study
Free access

Official registration: Khan Academy Chemistry

93. Khan Academy: Physics

Course topics:

Motion
Forces
Energy
Electricity
Waves

Conditions:

Beginner friendly
Basic mathematics useful
Online study

Official registration: Khan Academy Physics

94. Khan Academy: Economics

Course topics:

Supply
Demand
Markets
Macroeconomics
Microeconomics

Conditions:

Beginner friendly
Online study
Free access

Official registration: Khan Academy Economics

95. Khan Academy: Computer Programming

Course topics:

JavaScript
Drawing
Animation
Web programming
Coding basics

Conditions:

Beginner friendly
Computer required
Online practice

Official registration: Khan Academy Computer Programming

96. MIT OpenCourseWare: Introduction to Sustainable Energy

Course topics:

Energy
Electricity
Sustainability
Environment
Energy systems

Conditions:

Self-study
Basic science useful
Free materials

Official course: MIT Sustainable Energy

97. MIT OpenCourseWare: American History Since 1865

Course topics:

US history
Politics
Society
Economic change
Modern America

Conditions:

Beginner friendly
Self-study
Free materials

Official course: MIT American History

98. MIT OpenCourseWare: Science Activism

Course topics:

Science
Society
Gender
Power
Social change

Conditions:

Beginner friendly
Self-study
Free access

Official course: MIT Science Activism

99. OpenLearn: Introduction to Bookkeeping and Accounting

Course topics:

Bookkeeping
Double-entry
Balance sheets
Profit and loss
Accounting basics

Conditions:

Beginner friendly
Basic mathematics useful
Online study

Official registration: OpenLearn Accounting Course

100. OpenLearn: An Introduction to Artificial Intelligence

Course topics:

AI history
AI development
Ethics
Society
Future of AI

Conditions:

Beginner level
No programming required
Online study

Official registration: OpenLearn Introduction to AI

How to Choose the Best Free Online Course

Before starting a course, check these points:

Course level: beginner, intermediate, or advanced
Study time: short or long course
Language: make sure you understand the course language
Certificate: check if a certificate is free or paid
Course content: choose skills that match your goals
Official website: use the official course page

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