Check here for an awesome reference for JS interview questions.
Or if you're just starting out and are looking for some more structured guidance, check out Freecodecamp, NodeSchool (especially for backend), Javascript30, coding challenge sites (such as Code Wars and HackerRank) and of course MDN!
For deeper dives into all of the quirks of JS check out Javascript Garden and You Don't Know JS, and Mozilla's ES6-In-Depth.
And a good book for in-depth discussions of the topics covered by the resources above is Eloquent Javascript.