What is steemit and how to use it

Firstly we should start from steemit what is it?Steemit is a blogging and social networking website on top of the Steem blockchain database. The Steem blockchain produces Steem and Steem Dollars which are tradeable tokens users obtain for posting, discovering, and commenting on interesting content doing in it and now come to the second point how to use it?
Simply u got ur account approved from steemit and comes to blog and start posting about anything.

Important points
1:if u post a blog then it should not remove from it
2:if u use tag and now u want to remove tag it should not remove