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Steem Power is when you powerup your Steem, it gives you the power to upvote others and yourself. SP also gives you bandwidth, without sufficient (a minimal) bandwidth you can't post, reply, transact, etc. continuously and you run out of bandwidth too quickly

do you plan to start posting regularly?

@dj123 - correct, I can't upvote. This is why I got pissed & left & NO ONE seemed to know what that meant.

I saw a very long thread on the differences between SD & SP, but it was too long for me to read.

Right now I can post, but can't upvote which sucks.

I will be posting more, but not every day. I'm very busy right now & I still have to learn how to style the posts.

Someone else said he was going to teach me, but he never came back. He must be busy or just forgot.