Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
Thre is a lot of wepons in cs go. But i love shotguns so much. Noboty uses them but they are one of most powerfull weapons if you know what you are doing.