When I go through my upvote notifications, I've noticed that some people still have their automatic votes set to 30 minutes. I guess if you haven't been following 
So, be sure to change your Steemvoter or Steemauto rules to vote after 15 minutes. It will make a significant difference to the amount of curation rewards that you'll receive.
I know that this information is pretty much redundant for the vast majority of my readers, but not everyone is on Discord or in close contact with someone who knows this type of stuff. If 
You can read about this change in
Self Votes
Also worth a quick mention is the fact that self-voting makes less sense now than it did before, so if you're still upvoting your own posts, you might want to reconsider.
Before HF20, you would receive 100% curation rewards from your own vote if you voted before the 30 minute window. This has changed, so the curation reward you would normally receive goes back into the reward pool.
Note that this only affects authors who vote for themselves before the 15 minutes mark. I don't think anything has changed if you self-vote after 15 minutes. Please mention it in the comment section if this is incorrect, I am not 100% sure.
There's a whole debate to be had about self-voting and you're more than welcome to state your opinion in the comments. I've personally stopped self-voting altogether, though I sometimes accidentally vote for myself through a curation trail. I don't mind that too much, since it's only for a couple of percents.
That's it! I hope that this was new information for at least one person, since this is already such a heavily discussed topic. Either way, I'm sure that some newbie will eventually find this post and learn something new.