In this article I'll show you five interesting repositories in GitHub.
es6-cheatsheet I've found this repository by David Leonard (DrkSephy) that I find very interesting, helps a lot with es6 JavaScript, there's a lot of helpful information and examples showing this technology.
Developer Roadmap This is a great Roadmap to becoming a web developer in 2021 by Kamran Ahmed (kamranahmedse). In this repo you find a set of charts demonstrating the paths that you can take and the technologies that you would want to adopt in order to become a frontend, backend or a devops.
Coding Interview University This repository is very interesting, it's a very complete multi-month study plan for going from web developer (self-taught, no CS degree) to software engineer for a large company. By John Washam (jwasham).
You don't know JS Here Kyle Simpson(getify), shows us a repository very interesting for the ones that are starting to learn JavaScript.
Public API's This is a collective list of free API's for use in software and web development.