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That was Steem Dollars not Steem, they are two different alt coins.

As far as cashing out... which is the better to keep? Steem Dollars, Steem, or Steem Power? Is it better to keep all three? I am only on my second week now...

I wouldn't cash out just yet :) wait a few months, if you have the patience a year. Thank me later

Definitely, my account doesn't seem to be worth much yet anyway. I figure the more steemit grows the higher our account values will grow too. For now I'll just enjoying the small gains here and there while enjoying, sharing and connecting. Thank you for the advice... I'll do my best to be patient ;-) and I'll follow you too :-)

You should better keep at least 6 STEEM of your own stake stored as Steem Power (not of the delegated stake you got when you joined and possible other delegations) if you want to be anywhere near sure to maintain access to your account.
Which is better to keep is a trading/investment bet.
Steem Power is just Steem locked in your account like a saving account.
You can redeem it during a 13 weeks power down period, during which you redeem about 1/13th each week after you started the power down in your wallet.
In your wallet, your delegated stake is the number within bracketsin the left side of the "STEEM POWER" row.
It can be taken away from you at any moment, and gradually it will.
Your earned stake is the number outside of the brackets in the same row.
This number should better be above 6 just to maintain control over your account.
Whomever or whatever has your active key or master key controls your funds and can power down and transfer funds out of your account to his/its own account elsewhere, like other accounts or exchanges.

Thank you, it is still a bit confusing for me but I hope in time I will understand it better. For now I will just continue to post, comment, upvote, and resteem when I can. I appreciate you taking time to help me understand more. I'll follow you . Thanks!

I now edited my previous reply.
After you read it again, inform me if there are still discomprehensions.