u/ForsakenNectarine949

I am trying to learn build systems, Please Guide me where can I start learning Cmake from

Hello, I am a beginner programmer, I have been learning C++ for quite some time now(6 months) So far I have learned a library called Raylib and tried making some useful reallife projects like some 2d games like among-us, PAC-Man, and some console first person shooter games also a todo timer, I wanted to know how exactly I can start contributing to open source projects, like find them and then look what I can improve, etc... I am really confused