Here are some things that are important but easy to forget:
The Voting Power (VP) with your Hive Power (HP) combines to determine the value of your vote, which determines the rewards of posts after maturation (7 days).
The rewards are currently split 50%/50% between the creator (who wrote the post) and the curator (who voted in).
Rewards are only full on the first 24h. (Details to be expanded, sorry)
Everyone says your votes are money. But... Only if the thing you are voting on goes beyond the Dust, which is 0.02 Hive. A reward less than that is negligible, so the vote is "wasted".
Your voting power recharges around 20% per day. Which means around 10 100% votes per day. So... not voting also means wasting these votes.
The Hive value is actually calculated based on VESTs, so many less than 0.001 Hive votes actually can aggregate and rise the reward. Conversely, many curation rewards of less than 0.001 Hive can aggregate as well.
Most of these infos came from this wonderful intro to hive. Anything else I should add? Let me know so I can expand this post!