If you want to make music but don't know where to start, your first port of call should be GarageBand. This is all you need to know about laying tracks in Apple's music tool for macOS.GarageBand for MacMac's screen. That is, creating the music, producing the track, mastering it, and creating a final song you can share or even sell.GarageBand is a big stepping stone for Mac users, due to being able…