How to use steemit?

Would anyone of you please explain in a post of a video how to use Steemit? i have been looking for one week about a video that explains how to buy and how to deposit steem into steem it but there was no one out there. Please make a video or a post and explain to us everything about steemit wallet and how to use it properly. Please there are newbie who are really in need of this.

Thank you guys