How does one make a mod?

[Wholfe1999]

To be specific, how does one make a mod? I thought that maybe i could mod Biomutant and fix a few things, which is why i ask. What's the process like?

To get even more specific, there are 2 resources on the game called Bio-points and Psi-points. Bio-points allow you to upgrade resistances to the game's biomes (capping to 100% for each) and specific mutated abilities. Psi-points are used to purchase magic abilities. With that being said, once you purchase all your upgrades with those, there is nothing left to buy. Also, once you start NG+, you just start earning excess points. So I thought maybe I could make a mod that allows the player to use those excess points to boost the player's stats (health, melee damage, crit, magic damage, etc, etc).