how do i copy and paste

These are basics of using a Mac, copying and pasting is no different than using a PC. If you prefer keyboard shortcuts :

• Command + C = Copy
• Command + V = Paste
• Command + X = Cut

As far as closing an App, you click the app name in the upper left and click the Quit (insert App name) and it closes. The keyboard shortcut is Command + Q.

Spend some time reviewing macOS User Guide - Apple Support

Your welcome. I think you may find the following useful: https://www.youtube.com/watch?v=67keaaWOKzE

https://www.imore.com/meet-your-new-mac

Beginner's guide