https://www.reddit.com/r/BaldursGate3/comments/16kg48i/how_to_mod_bg3_beginner_friendly/The BG3 Mod Manager is pretty simple. You just open it up, tell it where your BG3 game data is located (You only have to do this once). Then click "Import Mod" and select the .pak file you downloaded from a site (You download a zip file, then extract it and inside will be a .pak file) and move it into the active mods section and click export mod order.
Alternatively, there's also the in-game mod manager that you can use to install mods. Just find a mod you want and click apply and away you go.
The difference between these methods is that the in-game mod manager only features mods that are from mod.io, ones that have been approved for console release. While BG3MM allows you to use mods from places like Nexus Mods.
