fCC
freeCodeCamp
Programming Languages
JavaScript Algorithms and Data Structures
JavaScript from variables to recursion, object-oriented and functional programming.
Free certificateDetails
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Programming Languages
CS50x: Introduction to Computer Science
Harvard's legendary introduction to computer science and the art of programming.
Free to enrolBeginnerPaid certificateAdded 28 Jul 2026
Rating4.9 / 543k reviews
Duration100+ hrsprovider estimate
Lessons11modules
Learners4.2Menrolled
H
Harvard Online
University
Courses are free to audit; a verified certificate is optional and paid.
About this course
CS50x teaches you to think algorithmically and solve problems efficiently, starting in C so you understand what a computer actually does, then moving up through Python, SQL, HTML/CSS and JavaScript. Problem sets are demanding and graded automatically, and the course ends with a final project of your own design. All material is free forever; only the verified certificate is paid.
What you'll learn
- Reason about algorithms, memory and computational complexity
- Write and debug programs in C, Python and SQL
- Build a dynamic web application from scratch
- Ship a self-designed final project
Syllabus
- 1Scratch and computational thinking3 hrs
- 2C, arrays and algorithms24 hrs
- 3Memory, pointers and data structures22 hrs
- 4Python and SQL26 hrs
- 5Web track: HTML, CSS, JavaScript, Flask18 hrs
- 6Final project7 hrs
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