How to get started in math?

Question

Mathematics

I study in the 9th grade, in the Physics and Mathematics Lyceum. I understand mathematics at a level, I would like to go deeper, but I don’t know where to start. There is something in the plans, but I can’t imagine what is relevant now, what is not, etc. I would like to read interesting theories or something that will broaden my horizons, or something, will somehow affect the approach to solving problems ..

Answer 1

If the level of mathematics is 4+/5, then, I think, solving Olympiad problems will help.
They will force you to look at tasks more broadly, to look for non-trivial solutions. Then school tasks will be like cracking nuts)