First, you write posts and comments, like this. So, you wrote this comment here. Then, I can like it or upvote it and that might give you some money, as in Steem, Steem Backed Dollars (SBD or SD) and maybe some Steem Power (SP). So, normally, you get some SBD and SP through the votes (upvotes) you get from others and from yourself too if you vote for yourself but there is a limit to how many times you can vote each day and your voting power drains and gets smaller each time you vote each day or two. So, you can improve your voting power when you vote on things that become popular.
Your voting power recharges after a day or two...... and you have to be cool and helpful or whatever to make more money maybe. You have to be like lucky and try to have conversations with people and stuff. Try different things and focus on doing what you like doing on Steem, on Steemit.