Setting track markers

I have Audacity 2.2.2 operating on Windows 10. Please explain how to position and set track markers to an already recorded project. Does Audacity have a facility to automatically set track markers?

Audacity uses “labels”:

There’s an effect called “Silence Finder” which can help to mark the gaps between songs:

Thank you Steve. I have checked out the labels idea and the “Silence Finder” worked in the test which I set. I hope that everything will be OK now. David