CoSMOS Gamehacking Tool

Hello, my name is Federico, i'm interested as the title says, how programming trainers work?
which programming skills or other skill do i need? can someone help me to understand?
thanks

I'm also starting off learning to create trainers. My advice is to simply follow the CoSMOS tutorials on this very site. You can also find some tutorials for CoSMOS on YouTube. Understanding assembly is useful and the concept of AOB (Array Of Bytes) is critical to building re-usable scripts. It's taking me a long time to get my head around it all but as with everything, practice makes perfect!