This list from physics nobel prize winner Gerard 't Hooft "How to become a GOOD Theoretical Physicist" is quite amazing.

But in case you are interested in the dark side you should read Gerard 't Hooft`s article on "How to become a BAD Theoretical Physicist" https://www.staff.science.uu.nl/~hooft101/theoristbad.html

This is fantastic! Besides listing text/topic recommendations, it has lots of pdf documents.