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Well, upvoting and resteeming doesn't cost you any steem power or SBD. Upvotes use your voting power, which gets down with each of your upvote and is filled again automatically by around 20% every 24 hours. You can check out your voting power on steemd.com. Also check out steemstats.com and steemdollar.com.

Resteeming doesn't cost you nothing. It's just way of sharing a post you liked with your followers. People usually resteem a post which they have upvoted, so that it gets upvoted more after them which in turn earns them more curation rewards. Hope it helps.

Great Thank you for the info.

Thank you @tigerfish.
Resteeming costs me nothing.
Right now my vote on 100% is worth 0.23 $

How does one increase the value of your vote?

The more steempower you have the more weight your Vote will have. If you want more practical influence then you need steempower.

You can also chose that your rewards of your posts goes 100% to your steempower.

Thank you again for your help, now I need to know how I do that and if its reversible.