Hii dear

let me clear your doubt.

There are various u tube channel where you will get detail explaination regarding every topic of modern physics. It will surely help youbout and clear all your doubt. Also I will suggest ypu to go through the book modern physics by Arthur beiser, Shobhit Mahajan, s.rai Chaudhary.this is easily understandable as it is written is easy language.

I hope my answer will be helpful for you

Good luck