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.
Hopefully I am asking this question in the right place, but, I was wondering, are there any plans to add Skyrim Special Edition among the rewards? There is an older version of Skyrim, the legendary edition, but it has been a few years since a newer version has been released.