Greenluma in the big 25? How to use it plz help?????

So ive been getting a lot of videos about steam tools and other tools to get steam games for free and dlc for free so i wanted to ask the best of the best! ive heard about green luma and i downloaded it on the cs rin ru website and i just cant really understand what the post says could someone explain to me how to use it and also is it bannable? i wanna use it on my main account and get some stuff and also can it be used for multiplayer games like forza horizon 5 to get dlc or something like euro truck sim 2 and get all the dlc