How to mod the game?

Hello everyone I have a question, how do I mod the game? Is modding this game similar to dwarf fortress? I mod alot in that and it very easy to add alot of changes, but what about here and what are the limitations? Anything here hardcoded that I can’t mod, what I mostly want though is the factions to work. Also I want survivor camps which are camps away from town and the zombies and is occupied by fellow survivors and military personnel trying to rebuild society.

Anyways were can I get up to date mods? The only mods I can find are ones from last year which I think is outdated unless much haven’t changed.