Save to config file, Game user settings? [small question

So i want to save graphics settings to a config file along with some custom variables that i specify. It seems i always go off and start something without realizing that there is already a simple solution. I have followed this tutorial and it tells/gives my everything i need to do what i want to do BUT is their already a graphics file that i should be using? etc? i cant seem to find anything from numerous google searches.