I'm new to this please help !!!!!

so let me get this straight. you can only make copys form backups, not the original. and where do the backups come from if it is so hard to do, or not many people have the know how. are people downloading the games from somewhere then copying that. is the cdi file what you need. you can't create a cdi image form the original then burn it? wish there was simple answers for us idiots. i read alot of post but just got confussed. please post some simple straight forward answers for stupid people like me. please!!!!!!!!!!!!!!1