Harvard Online
CS50x: Introduction to Computer Science
Harvard's famous intro to computer science, from Scratch and C to Python, SQL and the web.
Free certificateProgramming
120 hrsBeginner
173 free courses
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freeCodeCamp
JavaScript Certification
freeCodeCamp's rebuilt JavaScript certification: language basics to DOM, events and async code.
Free certificateProgramming300 hrsBeginnerfreeCodeCamp
Python Certification
freeCodeCamp's new interactive Python certification, launched December 2025, with a free exam.
Free certificateProgramming300 hrsBeginnerUniversity of Helsinki
Python Programming MOOC 2026
University of Helsinki's free Python course with automatic exercise checking and optional credits.
Free certificateProgramming200 hrsBeginnerMadhavan Mukund's NPTEL course on Python, sorting, searching and core data structures.
Paid certificateProgramming48 hrsBeginnerMIT OpenCourseWare
6.0001 Introduction to Computer Science and Programming in Python
MIT's classic intro to computational thinking and Python, with full lectures and problem sets.
No certificateProgramming60 hrsBeginnerMIT OpenCourseWare
6.006 Introduction to Algorithms
MIT's core algorithms course with Erik Demaine, Jason Ku and Justin Solomon.
No certificateProgramming90 hrsIntermediate