How steemit work?

in #helplast year

After a long time I back on steemit, but I don't know how it's works. Can anyone help me out to understand it? please
thanks :)

Coin Marketplace

STEEM 0.30
TRX 0.12
JST 0.033
BTC 65143.22
ETH 3203.33
USDT 1.00
SBD 3.88