I read them, but like I said, I wouldn't doubt that the CH staff uses programs more powerful than what is shown there.

1) programming language to program you trainer in (or use cheatengine to make trainer)
2) memory searcher (like cheatengine)
3) disassembler/debugger (like ollydbg)

each of those things requires time and experience to get good at. nobody here is going to teach you how to make trainers like cheathappens or any other good trainer makers out there. you need to look at the tutorials here and go to the forums at gamehacking.com or cheatengine.org

good luck!
best,
Cal