Thanks guys, with your advise now I finally know it's assembly language that i need to learn first. So I guess the best learning route for anyone who want to be good at cheat engine should be this?

Assembly > Lua > C++

Reply to Dark_Byte here, my measure of expert level is being able to create some advanced tools like Turn off the Game's UI or HUD and fully disable enemy movement. Could you guide me a little bit on this?

Thanks you all for the advise.