Learn how to create hacks for dbd
Hey, i have checked out some dbd hacks from the mpgh community. I've been trying to understand how y'all are able to reverse engineer and find out how to create the hacks but i have not really understood how its done yet. For example how to inject save files to bhvr servers, how to change cells, shards, level etc. I would really appreciate if someone could help me understand how this all works

Through the power of Google.
Hacking online games is a bit tricky. All you need is to perfectly understand some programming nouns like adresses (the most important), if statements, loops, variables, functions and binary / hexadecimal system.
This is only the beginning
Then you have to know how the game works (reverse engineering here).