jQuery on freeCodeCamp
Once you have completed the Javascript courses that are provided here, I would highly recommend that you start dabbling with jQuery. To put it simply, jQuery is prewritten Javascript code. Programmers throughout the years have built upon the older code and saved it in these things called libraries. These libraries give us access to functions and code that we don't have to write from scratch. Once you start getting the hang of it, jQuery becomes a powerful weapon at your disposal.