STEEMIT pays, FB, Youtube, Twitter, etc, doesn't.
Post about anything you wish, provide the source of your post if you must; otherwise, the community loves original content. Try to remain truthful and professional, this will help your reputation to grow.
You don't have to but I strongly recommend you to buy STEEM and cornvert it into STEEMPOWER ASAP so you gain voting power.
Read the STEEMIT white paper, the use of the page is really simple; if you post you get paid, if you vote you get paid, if you comment you get paid. Make sure to follow people with serious and relevant posts and become relevant also.
Tell others about STEEMIT, try very hard to UNDERSTAND BLOCKCHAIN technology, this will eliminate lots of questions and for other features of the page use this link
http://bfy.tw/BDCu
GOOD LUCK AND WELCOME! 🤓 😎