I’d say to keep the UX as clean as possible. Perhaps popups with very simple 1 or 2 sentence explanations of what the user is looking at. And I’m inclined to resist the temptation to provide too much in the way of a didactic explanation of what the upvotes and downvotes “mean.” The like button on social media ends up meaning different things to different people, and that’s fine. We can add more sophisticated methods of feedback in the future, but we don’t need to do that now. Baby steps.