MDN is pretty much the best reference site that could possibly exist for JavaScript and web development, so get familiar with it and use that as needed. They have some beginners tutorials which are nice if you just want to get a peak and practice at certain topics. They have a full curriculum for learning web development that I'm sure is good but I haven't looked closely at.
Generally, I think The Odin Project is the best full curriculum for learning web development from zero knowledge to proficient. Like any other resource, it won't resonate with everyone, but it's worth a look if that's what you're after.