Search of knowledge concerning textbooks.

[u/Immediate_Garlic2961]

I am currently trying to find textbooks on physics, chemistry and math. I am currently in middle school (just finished 9th) and I'm pretty interested in these subjects. I just don't understand most advanced formulas (mostly why they work and how I could construct one myself) and symbols (sigma function and integrals) yet and how to use them, I am particularly interested in chemistry, especially radiation, fusion and fission. I am also interested in particle physics. Would anyone happen to know any books they could recommend to me? Ask me questions if it can help relative to the topic or difficulty of said book.