If you use a Steam Deck, then the first thing I would always recommend is to install Decky Loader. From there, one of the first plugins I'd recommend is SteamGridDB, because let's face it, the box art isn't always the best artwork you can have in your games library.
Now, though, SteamGridDB is also on Windows 11. We first covered SteamGridDB for Windows 11 a while ago, but until recently I hadn't really given it much notice.