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Core concepts every developer needs
Logic & Problem Solving (Week 1-2)
Algorithms & Data Structures (Week 3-6)
Git & Version Control (Week 7-8)
Harvard (Free)
freeCodeCamp
freeCodeCamp YouTube
CS50 / freeCodeCamp
Harvard's complete CS50 course covering programming fundamentals, algorithms, and computer science
freeCodeCamp.org
Complete beginner-friendly course on programming basics and computer science fundamentals
Programming with Mosh
Comprehensive introduction to algorithms and data structures
Harvard via edX
Harvard's official CS50 certificate - audit free, pay only if you want verified certificate
Free certificate after completing 300 hours of coursework
Complete certification in algorithms and data structures
Coursera (Google)
Google professional certificate - free to audit all courses
Algorithm practice
Problem solving
Coding challenges
Deep Dive - Character Encoding
Technical Whitepaper - System Architecture
Strategy Guide - Algorithm Complexity