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• Coding Practice:

  • https://www.codecademy.com/​

  • https://leetcode.com/

  • https://www.hackerrank.com/

  • https://codeforces.com/?f0a28=1

  • https://www.udemy.com/course/understanding-computer-programming-beginners-roadmap/

• Python

  • https://www.learnpython.org/

  • ​https://docs.python.org/3/tutorial/

  • https://www.udemy.com/course/pythonforbeginnersintro/

• Java

  • https://practiceit.cs.washington.edu/

  • https://www.udemy.com/course/java-tutorial/

  • https://www.udemy.com/course/java-programming-basics/

• C++

  • https://www.learncpp.com/​​

  • https://www.udemy.com/course/free-learn-c-tutorial-beginners/

  • http://www.cplusplus.com/doc/tutorial/