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You can either buy Steem with bitcoin, get some through post rewards. Their utility is to power them up. The reason why Steem Power exist is so that someone cannot vote 2 times with the same Steem. Because Steem Power are lock someone can't send themselves their Steem and then revote a second time on the same post.

My dear friend "get some through post rewards." I Posted a lot of photos..I only got Steem Power or SBD but no Steem .. I politely ask you the 3rd time..How do I earn Steem ?

Through post rewards. The new rules make it so that you are being paid only 7 days after you post. You'll receive Steem. Also I wrote you can buy some. Also maybe sometimes you'll receive only Steem Power and SBD for your post. You can also power down.

Why I havent received any Steem yet? (4th time)
I Have received many post rewards.. including SBD and Steem power BUT NO STEEM.
Why is my question so difficult to understand?

It's actually the first time you ever asked:

Why I havent received any Steem yet?

The other time you ask, How do I get Steem? Which is very different.

I'm being nice to you don't be rude toward me please. Thank you. I don't know why you haven't received any Steem.

You're right. You only received SP and SBD for your posts.
https://steemdb.com/@prakashghai/authoring?filter=posts

But sometimes for some reasons you'll receive some Steem. I thought we always receive some Steem but I was wrong on that and stated so pretty early on. Also I don't work for Steemit inc. I'm here answering your questions because I feel like it.

https://steemdb.com/@teamsteem/authoring?filter=posts

No no I am NOT being rude.. just losing some patience as since yesterday I am asking you about Steem. No problem..if you have no information...its ok I am ok not to understand it. You relax. @TeamSteem :)