For the majority of use cases a simple rule suffices: Write a parser which generates LLVM IR and feed the IR into LLVM. You only need to research two topics: parser generators and LLVM IR, and both are pretty simple skills to pick up.
There are a lot of cases where that doesn't work (eg. writing a functional language or a JIT or doing programming language research) but those are edge cases. In those cases you probably want to read one of Appel's books ("Modern compiler implementation in ML" for example), or the Dragon Book.
There are a lot of cases where that doesn't work (eg. writing a functional language or a JIT or doing programming language research) but those are edge cases. In those cases you probably want to read one of Appel's books ("Modern compiler implementation in ML" for example), or the Dragon Book.