https://www.theodinproject.com/paths/foundations/courses/foundations
Learn the foundations of web technologies with lessons and projects with The Odin Project
https://www.theodinproject.com/paths/full-stack-javascript/courses/javascript
In this course the only thing you need to learn is asynchronous JavaScript.
This includes promises,
callback functions,
and the async await syntax.
JavaScript Promise in 100 seconds - YouTube
The Async Await Episode I Promised - YouTube
Here are some helpful video resources as well.
https://www.theodinproject.com/paths/full-stack-javascript/courses/nodejs