Great blog post, give it a read.
I love your enthusiasm and I love that you are asking questions! Also cool that you feel an urge to learn.
That being said, it is rather many questions you are asking at the same time :)
Watch this brilliant series, it should give you a grasp of what is going on, then take it from there.
Computer Science Crash Course: https://www.youtube.com/watch?v=O5nskjZ_GoI&list=PL8dPuuaLjXtNlUrzyH5r6jN9ulIgZBpdo
On bike? Flipping off? Boris Johnson?
I died as many times on the very last level, as in the rest of the game combined 😅
Loved it
I have had a bunch of problems with PS5 controllers recently.
I am noy sure you are experiencing drop outs due to physical limitations, rather due to (as I recall) recent restructuring of the kernel code handling connections to the controller and regressions introduced herein.
One way to rule out physical limitations, would be to stand next to the PC and see how it fares. What is your experience like then?
What you are looking for is some kind of on screen display overlay.
I found this, see if it can be of any use : https://github.com/vascofazza/Retropie-open-OSD
Rest in peace. What a fine humble man.