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You can get them randomly if you already got all trading card drops from a game.
Every time someone crafts a badge for a game a booster pack is created and gets randomly assigned to a user who is eligible for it. The higher your Steam level and the more games you own that are eligible for booster pack drops, the higher the chance to get one.
Thats all.
You also can create booster packs in exchange for gems but only for games you own.
You can get steam wallet funds which you can use like normal currency to buy stuff on Steam. You can't cash them out though.
From my observation, the only time it's useful to create a booster pack is if the cards are not marketable.