Documentation:

(MDN) https://developer.mozilla.org/en-US/docs/Web/JavaScript

(jQuery) https://api.jquery.com/

(NodeJS) https://nodejs.org/en/docs/

(Typescript) https://www.typescriptlang.org/docs/home.html

(Discord.js) https://discord.js.org/#/docs/main/stable/general/welcome

Tutorials:

(Eloquent) http://eloquentjavascript.net/

(You Don't Know JS) https://github.com/getify/You-Dont-Know-JS

(MDN) https://developer.mozilla.org/en-US/docs/Learn/JavaScript/First_steps

(Modern JS) http://javascript.info/

(Evie's Accelerated JS Tutorial) https://evie.gitbook.io/js/

(JavaScript Promises for Dummies) https://scotch.io/tutorials/javascript-promises-for-dummies

Discord.js: https://anidiots.guide/

https://discordjs.guide/

Other:

(You might not need jQuery) http://youmightnotneedjquery.com/

(You might not need jQuery 2) https://github.com/you-dont-need-x/you-dont-need-jquery

(CodingTrain | tutorials with examples using p5.js) https://www.youtube.com/user/shiffman