If you want to quickly and effortlessly get a case in CS GO, then the best option is to buy it on the website. In the case of the game, you need to get the case itself, buy a key to it, but on the site you just pay money for some random item from the list of things in this case. There are many good sites for opening CSGO cases, but from personal experience, I would advise you to go to https://bloodycase.com/. Here, the prices are pleasant and a wide variety of exclusive CSGO weapon cases with the most interesting skins.