how do i study maths or physics

i find these subjects to be quite interesting but i struggle with being consistent for these. lets say i miss one day of maths practice like my entire foundation is basically lost and i get really confused, and thats where the issue arises for maths, i dont know how to be consistent and i also dont know how to do the math problems. for physics its another case. i enjoy learning about physics but unless i learn everything going on in something like whats happening in the atoms, why it happens, basically small details which just support the physics topic i once again get confused in studying physics. in school mostly surface level things like definitions and some other stuff are taught so im just lost. sometimes this even happens in math i need to know every little rule. what do i do