Many people don't know. Only use it for posts and people you enjoy. It's a waste voting for posts on the trending page. Find some like-minded people, work together, slowly build yourselves up. The more SP you have, the more you can give with your vote. Keep in mind the voting power is limited so at first you'll want to vote for about 10 posts per day, until you can adjust the voting power with a slider, then you can give out more lower powered votes. Try to vote for posts around 30 minutes after they've been published for best curation rewards. The more SP you have, the more curation reward you'll get each time you vote. You can trade SBD for STEEM in the market here and power that STEEM up as well to help speed up the process of accumulating STEEMPOWER(SP).