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Did you already checked Main post ? if not, it's recommend you to read it. As the below content is next part of Main post post.
When you earn Steem Dollars for creating content, you have three choices:
You can convert the Steem Dollars to Steem and sell it immediately on the open market for real money, essentially cashing out.
You can hold the Steem Dollars, which keeps the money in the network and pays you 10% interest. You can sell them at any time. If you think the value will go up and want to sell at some point in the near future, this is your best option.
You can exchange your Steem Dollars for Steem Power. If you want to invest in the future of the currency and reap the biggest rewards, this is the way to do it.