Basically how it works is that you send X amount of SBD to a bot and add the link to your post in the memo, and in return that bot will use it's voting power to upvote your post. The bots I mentioned will upvote your post with more money than you sent it. For example, I think minnowbooster requires you to pay 0.5 SBD, but you can get an upvote worth between 1SBD and 2SBD. I have gotten 1.54SBD upvotes whilst I paid only 0.5SBD. It's tricky though because as an author you don't get 100% of the rewards, but generally I think you gt more than you pay for. Plus, the main objective for me, is to actually be seen. Some of my posts will only get 6 views... not even talking about votes. So my first priority is actually being seen.