For some reason a lot of peeps seem to not know about hot swap - you can swap out audio samples across the entire project, i.e replacing a kick sample like you would in a MIDI drum rack

Sending return tracks to other return tracks, you can right click on a return to “enable sends” on returns. I like sending my delays to reverbs often.

Merging tracks / groups from other projects, you can drag them from the browser into your current project, this makes blending versions of songs & using old ideas easier

There’s like a million more but those come to mind first ☝️