I have been loyal to Xbox all my life but just ordered my SteamDeck OLED!
I was wondering is there any beginners advice you could give me regarding frame rates or any other adjustable settings that would usually be dealt with by Xbox automatically.
Also are there any games, accessories , software, etc you recommend?
Wired mouse even some dirt cheap like 10 dollars is the best accessory you can buy. This is very useful to play games that were designed with mouse in mind like basically all strategy games. For games try Ori Will of Wisp first(turn on hdr in settings if it is off).