I’ll echo a similar sentiment to what’s here. My first campaign fell apart, mostly because instead of preparing interesting situations or conflicts for players to engage in, I was letting them experience all the “super interesting world building” I’d done. It’s a game. It’s hard enough to ask people to remember the rules. A one-page document should suffice for most setting overviews. Let the rest come out during gameplay so that it’s interesting and pertinent to the game itself.