I’m not sure tbh, there’s a few different tutorials on youtube for how to install mods. I personally just transferred them from my pc to a usb and then to my SD.

Don’t have an exact modlist off the top of my head but the main ones I use are Skyrim 202x (1k textures version), SMIM, Skyrim Flora Overhaul, and Enhanced Lights and FX. It looks overall pretty good on the SD, definitely an improvement over vanilla, I’m sure there’s other graphical mods but it’s all just personal preference.

Skyrim SE used to run like shit on the deck with graphical overhauls, had around 25-30 fps in outdoor areas but now even with maxed out settings I get 50-60 and it feels a lot better to play.