bbCode

FreeCodeCamp: http://freecodecamp.org/

CodeWars: http://codewars.com/

MongoDB University: https://university.mongodb.com/

YouTube Channels:

1. https://www.youtube.com/user/TechGuyWeb
2. https://www.youtube.com/channel/UCFbNIlppjAuEX4znoulh0Cw