We could sit here and try to explain it all day, but it’s best to start here:
The gist of it is that you have “layers” you can have multiple layers on one project or you can “nest” inside one another.
Here’s an example of using the “00” tab at bottom set to “line” which with enough power and slow speeds and right number of passes will “Cut” or score depending on settings.
The second blue one is “engrave” because it’s filling.