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.
Go to Render and make sure your Frame Cap is set to 0 so that way it can go as high as it can. This is not only important for your game itself but also for Slide-Hopping because the higher the frames, the faster you can slide-hop after you learn how to do so. (The other settings are really just depending on how you want to play it.)