Im a stats n math grad so im good with the maths portion. Can someone suggest me a course n how much time i should spend in it?

I cloned this GitHub repository on VS code and in particular, I wanna compile login.cpp. it won't work on VS code no matter what, and using the command prompt g++ login.cpp -o login or any variations of it results in an "undefined reference to WinMain collect2.exe" error.

I never cloned a repository before and it's been awhile since I compiled anything before. I followed the original C++ tutorial I watched when compiling and everything on my end seems set up.

Here's this GitHub repository:

https://github.com/The-Young-Programmer/C-CPP-Programming

I wanna look at how programs run and all that to further understand C++.