There are some games that honestly never do. Or even if they do they barely go on sale. Like there’s games on my wish list that have been there for 10 years now I think that have never gone beyond like a 10 or 15% sale. So there they stay
Depends on the game and the publisher. There are frequent sales as well as sales from 3rd party resellers. Check out IsThereAnyDeal.com which tracks all the prices and you can see how often a game has gone on sale at steam or any legit reseller.
another good one: https://steamdb.info/sales/history/
steamdb only tracks steam directly though, correct? Great site, just doesn’t track all prices if that’s what you’re going for.
If you haven’t played Hollow Knight, pick this up right now!
Don’t look anything up, don’t let yourself get spoiled. Just go in and let yourself be immersed in the world of Hollow Knight. It can be confusing and frustrating at points, but just hang in there and keep going.