Coding skills improvement resources

Books

Free of charge

• Open Textbook Library - https://open.umn.edu/opentextbooks/

Online learning platforms

Free of charge

• Thinkster - https://thinkster.io/

$$$

• https://www.codecademy.com/
• https://egghead.io/
• Frontend Masters - https://frontendmasters.com/
• https://instruqt.com/ - The Next Generation Hands-on Virtual IT Labs for Software Adoption
• Scrimba - https://scrimba.com/
• LeetCode - https://leetcode.com/
• Replit - https://replit.com/

Programming games

• Codewars - https://www.codewars.com/
• CodinGame - https://www.codingame.com/home
• Robocode - https://robocode.sourceforge.io/
• Gladiabots - AI Combat Arena - https://gladiabots.com/
• VIM Adventures - https://vim-adventures.com/
• SoloLearn - https://www.sololearn.com/
• Sphere Online Judge (SPOJ) - https://www.spoj.com/
• CodeGym - https://codegym.cc

DevOps learning resources

• Kode Kloud - https://kodekloud.com/

Logic and automation games

• Factorio - https://www.factorio.com/

Other resources

• https://www.makeuseof.com/tag/best-programming-games/

Obsolete

• KataCoda - https://www.katacoda.com/