You can earn digital tokens on Steemit by:
Posting - By sharing your posts, you can earn upvotes from community members. Depending on the upvotes you receive, you may get a portion of the "rewards pool".
Voting and curating - If you discover a post and upvote it before it becomes popular, you can earn a curation reward. The reward amount will depend on the amount of Steem Power you have.
Purchasing - Users can purchase STEEM or Steem Dollar tokens directly through their Steemit wallet using bitcoin, Ether, or BitShares tokens. They are also available from other markets and exchanges including Binance, Bithumb, BitShares, Bittrex, Huobi, Poloniex, UpBit, probit, bitribe, GOPAX, Lykke.
Vesting - STEEM tokens that are powered up to Steem Power will earn a small amount of new tokens for holding.