So I have been buying SP with my little earnings. I finally have over 10 SP, but what does this mean and how can I use it to my benefit?

Assuming that this isn’t what you meant above you can sell your SBD or rather use your SBD to buy STEEM on the internal market: https://steemit.com/market
Instead of buying SP on blocktrades. Lemme know if you have any questions on using the market.

After you have bought the STEEM through the internal market you can power it up through your wallet.

Also I did this from my phone so it may look different on a desktop (I’m also using night mode).

Please disregard if anything here was redundant.

Cheers!