This guide does contain the books that are usually recommended in a university course setting! So, it will require significant amount of time and effort to master it. One of the series of books that physicists religiously stick to is Landau and Lifschitz. But my experience has been that it's worth it only if you already have some basic understanding.
I never got on very well with Landau and Lifschitz it's pretty intense. I mostly used pdf lecture notes from different courses. They can be a bit mixed but many are very good quality and you can easily pick up a couple for the same topic if you don't understand some part of one of them
