Learn how to modify any PC game with this step-by-step guide, using Plant vs. Zombies 2 as an example featuring all bosses. It took me some time to figure it out, so I wanted to share my knowledge and teach you how to do it.
NexusMods.com
https://www.nexusmods.com/
The Frosty Tool Suite
https://frostytoolsuite.com/downloads.html