The thing about using maths comes in the case of cryptography and data security. Special sequences, matrix methodologies are used for securing or encrypting data. Prime numbers and related operations seems to have been used for these purposes. You don't need to be good in maths . Just learn the language properly. All the best brother 👌👌
It depends. Do you want to get into cryptography? Do you want to write a game engine? Or do you want to make a simple web app? Math is useful for things like cryptography. Physics is useful for things like game engines. And neither are required for web apps, but some of the more complicated ones will require some algebra.