500 internal server error in localhost

Hello, can help you fix the 500 Internal server error over teamviewer.. Hope to soon hear from you.

Sir, I can do this project. My goal is to provide best service for my clients in minimum possible amount. I will accept projects only when i'm 100% sure. Thanks! :)

I know the core of the working of servers and like lived with these errors. I think I already know where the problem is.