Concern for a newbie

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hi guys I am kindda new here I have some newbbie questions

I read that the price of steem dollars today is about 10$ and price of STEEM is about 2$ and i think I can change 1 STEEM into SBD so what is the diffrence between them?

And if I power down my STEEM POWER does it change into STEEM?

and do you recommend that I change my sbds to btc now or should I wait ?

&& THANKS IN ADVANCE

Concern for a newbie | Ecency