As someone who only learned a few things about programming, is optimizing code an easy thing? I've read about that many times but the only thing I could imagine (and I had to imagine it as I'm not really a programmer) is that perhaps their codes could be more efficient (so rewriting their code so that ten lines do the job of thirty for example) but I feel like if they lack the logic skills or math skills to do it then perhaps that's why the code contains large functions and such.

But again, I'm not a coder, so I've no idea how in practice code can be optimized.