I’ve heard from many people that regularly reading about math — especially Number Theory, Combinatorics, and Geometry — can really help in competitive programming.
I’m mainly focused on improving at CP, not studying deep academic mathematics, but I still want to spend some time each day building my math skills.
Could you share some good articles, websites, or resources that are helpful for learning math specifically for competitive programming?
I think you can start by solving AMC-10,12 previous year question and if you came across a question which uses things(formula,technique e.t.c) that you have no idea of, then you can simply google it and learn from there and may be, solve some question on that.
Rather than asking for resources you can just start practicing.
Mathematics require time and patience and you will learn new things in your way.
So, just start practicing.
GOOD LUCK..