How do I use libraries

I have never used a library when I program so I don’t know how to use a function that is in a library in my source code files does any one know how to?

https://microstudio.dev/i/gilles/quickengine/

Go to this link - this is a library.

Click clone - the code will be added to your projects. Go to your project and click "Import Libraries" (bottom left corner next to the code editor).

You will see all the projects that are libraries there.

Add one library - it will appear in the project's "\lib" directory.