GRAV-rtfm?

hi, i went to https://getgrav.org/downloads/skeletons; i got GRAV-rtfm, i find the idea of my “menu”; but i don’t understood (find) how to manage my own pages/menu with it?
Could you explain it for me/us please…

It’s just a regular Grav site. You should read how to manage pages, and how that effects your nvigation. Please check the docs: http://learn.getgrav.org