I mean it in all possible ways, Launchers, Apps, Wallpapers, Cases, Pens, Pen nibs, Screen protectors, Holders, etc ...
Tell me how you completely obsessed over certain things until you finally got it set up exactly how you wanted it. Tell me about the time you tried out 7 different screen protectors until you found the right one. (Also don't ask me how many icon packs I looked at until I found "Rondo")
I'd also appreciate any links to deep-dive articles or blog posts about this topic.
Besides that though, I don't do a whole lot. The Android 12 UI colors are nice to play with, but I don't think there are any game-changing tips that will blow your mind. Maybe set up Termux so you can do programming on the side?