I’m not sure if this is just another way of saying what others have said, but I also upvote if something accomplished the theme of the community. The example that comes to mind is from the other site, but if something on r/mademesmile actually made me smile, I upvoted. As for downvotes, I usually save them for posts that I want to be less visible for whatever reason. Sometimes that is because I disagree sometimes it is because they are reposts, or low effort trolling, etc. Right or wrong, that’s how I do it.