Well I like to think that I have one or two other posts that can help you acquire that knowledge. You can also check out previous videos on YouTube where I discuss the Steem System: https://www.youtube.com/user/afetherw8/videos. However, you can also simply choose to write about something you do know a lot about, something that you are already passionate about. There is no real reason you have to know exactly how Steemit works to use it, just as virtually no one who uses facebook actually understands how it works and yet billions of people use it without issue.