Here’s the thing when you hang out with writers: We pay attention. We write things down. Much of what I write about are my observations. I always say I don’t have to make things up. I just need to pay attention.
If you really want to understand a topic, don’t read about it, write about it. The act of explaining something helps connect the dots and commit them to memory far better than the passive act of reading.
Write little phrases that will “open a door to a scene”: Often, we can’t see our entire project in its full form, but we can see little pieces of it. A curtain moving in the morning light, for example. A man sneaking around a house. Jotting down these little hints “open a door” for your future writer-self.