You get steem basic income shares. It means that each time you post you get an upvote (depending on how many shares you have. You don't have to do anything, it will happen automatically. The more shares you have the bigger the upvote. You can read more about sbi here:, https://steemit.com/@steembasicincome/frequently-asked-questions
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Thank you so much for the explanation! I think it's a very interesting concept! :D And also thanks for having these very interesting contests!