I think manually modding really sucks. I got it working in the past using MO2 but the easiest way is probably to use SteamTinkerLaunch to install MO2 or Vortex, it does everything for you. That's also how I mod Cyberpunk using Vortex in my system, works perfectly fine.

I'll second this method for the Skyrim Special Edition. Works for me, although I don't have an extensive mod list. Just:

SKSE, SkyUI, Vilya in Skyrim, Unofficial skyrim patch, Achievements Mod Enabler.

Will be moving to the new Nexus app when it is out of alpha or enables Bethesda games.

For Oblivion, I'd do something similar.

For Morrowind, you should use OpenMW and install mods through that as they describe in their docs.

Assuming the new app doesn't suck. Vortex was pretty shitty even on Windows. Manual modding is trash because it is impossible to keep track of your mods (unless you're a very casual modder with only a handful of mods), which means eventually you just have to nuke the whole folder and start fresh. That's why you want to use a proper mod organizer.