How can I get better at C++ assignments?

I am working on a C++ assignment, but I keep getting errors in my code. Some students in my class mentioned C++ Assignment Help when they were talking about difficult programming tasks. I want to learn how to find my mistakes instead of just looking for answers. Loops and functions are the hardest parts for me right now. I have tried practicing, but I still get stuck. What is a good way to improve at C++?