#Disclaimer

Fo76 officially doesn't support mods

see https://help.bethesda.net/app/answers/detail/a_id/44429/kw/Mod

But still, at your own risk you may try & mod the game.

https://github.com/AlexxEG/BSA_Browser - extractor for BA2 and BSA files of Bethesda resources (in case you need to modify smth there and include that in your mod)
https://www.nexusmods.com/fallout76/mods/221 - Mod manager for super easy mods installation/removal
https://github.com/jindrapetrik/jpexs-decompiler - JPEXS Free Flash Decompiler