Yes. Read books and do ALL the problems. Books with answers are nice, but learning to double-check your work and convince yourself you are correct is also use

Yes. Read books and do ALL the problems. Books with answers are nice, but learning to double-check your work and convince yourself you are correct is also useful. Find others who are also learning and study with them. Find others who already know and learn from them. The key is consistent, long-term effort, but it is not easy.