How is Steem income calculated?

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So I had, if I'm not mistaken, 2 Steem. I've just withdrawn my Steem two weeks ago or so

So I am trying to do this investing on crypts, so I bought SBD through Bittrex. When the SBD deposit eventually got to my account, the amount of my Steem doubled.

Anyone know how Steem works?

I tried reading some posts here but the posts were outdated and kind of going around the bush so I might not have understood how.

Appreciate it.

How is Steem income calculated? | Ecency