Every developer should be aware of the following GitHub repositories.

Free programming books. Programming books that are available for free. The repo is now managed by the Free Ebook Foundation, a non-profit dedicated to encouraging the creation, distribution, preservation, and sustainability of free ebooks.https://github.com/EbookFoundation/free-programming-books

Coding interview university. A complete computer science study plan to become a software engineer. https://github.com/jwasham/coding-interview-university

JavaScript questions.There's a huge list of JavaScript questions and answers here.https://github.com/lydiahallie/javascript-questions

FreeCodeCamp.freeCodeCamp.org is a welcoming environment where you may learn to code for free. It is run by a donor-supported charity with the goal of assisting millions of busy individuals in making the shift to technology. The freeCodeCamp community has assisted over 40,000 people in landing their first developer job.
The full-stack development and machine learning education offered by FreeCodeCamp is fully free and self-paced. Thousands of interactive coding challenges are available to help anyone improve their coding skills. https://github.com/freeCodeCamp/freeCodeCamp

See you soon.