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.
There is nothing to say about it. I was going to buy an AK47, I checked all the other skins and their prices are increasing little little, day by day. And everytime you buy one, they give you BATTLE SCARRED even if its written "Random Quality" in description.