I’m a big fan of @[email protected]’s trick of preparing secrets, clues, or general plot point revelations in advance and without anticipating the context of where or how they will be revealed. That is, you just prepare a list of ten facts or details that will engage the players if and when they learn them, and you improvise how they learn them at the table. It’s great for when a player character unexpectedly goes to the library to aimlessly look for clues, or the PCs start talking with an NPC and you need to drop some nugget of info to make the conversation feel worthwhile.

https://slyflourish.com/sharing_secrets.html