How can we make money and survive in the steemit?

It's so hard to do steemit for the first time. Is there anyone who can give me basic knowledge and concepts of terms like steemdollar, steempower, and vote witnesses?
( ͒˃̩̩⌂˂̩̩ ͒)( ͒˃̩̩⌂˂̩̩ ͒)( ͒˃̩̩⌂˂̩̩ ͒)