How to become a GOOD Theoretical Physicist- A blog by Gerard ‘t Hooft (ext. link)
This blog explains how you can become a Nobel Prize-winning scientist. Also, the books you should read for that.
CafePhysics by Prof. Ananda Das Gupta
The blog was written by one of my Professor whom not only I but the whole IISER Kolkata respects a lot for his best teaching. He has explained some of the difficult concepts of physics like tensor very well.
Tips for scientific soft skills
Here you can find helpful tips to improve scientific soft skills and it also provides tips for your journey before Ph.D., during Ph.D., and after Ph.D.
Go for science
This website you will find useful for summer internships, institutes, and fellowships.
So You Want To Become a Physicist?
This link has a list of so many resources available over the internet to learn physics. It also suggests the books and lectures with the links for them.
Also check out: So You Want to Be a Physicist: 22 Part Guide!