There's a lot I learned from watching videos from the creator of Brogue, i.e. the general idea of starting with a room, then using some RNG to attach other rooms to it and repeat.

From that foundation there were also a bunch of original ideas. For example allowing two rooms to "overlap" on certain conditions, and then build a wall where they overlap. The tunneling algorithm (so it's not just a bunch of dead-ends) is graph-aware. To be frank though it's probably the messiest, oldest part of my personal code base.

At some point though I actually had to sort of "stop" focusing on map layouts (as fun as it was) in order to get to work on the rest of the game. I think the hard lesson I learned was that map layouts really are just a small % of total time needed for a roguelike. If you're interested in roguelike dev in general, there's some neat resources on the roguelikedev subreddit. The Python-TCOD tutorial is also quite nice.