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.
So when I'm commenting on forums my xp goes really wack. It's at 80% now and after I comment it goes down by like ten percent. Then the second comment brings me up to 83%. So I'm definitely not losing xp from spamming (which I never do) but it goes down and up randomly and I want to fix it before something worse happens.