JavaScript
w3schools
In my opinion, the easiest-to-understand docs on JavaScript on the web. Great for beginners.
mdn web docs
More thorough docs, but harder to understand for beginners.
/r/learnjavascript
Great place to ask javascript-related questions.
The Net Ninja
Amazing YouTube channel with all kinds of webdev-related courses. There are many webdev education channels, but this is the best one.
jsfiddle
A place to practice javascript in the browser, if you don't feel like opening up your IDE.
freecodecamp 7 hour course
Great 7-hour course on javascript.