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Don't do too much, or you will waste time and efforts
(ttrpg.network)
You can of course plan the big lines of the campaign, but the more precise you get and far ahead of the present, the more you will either lose or railroad to not lose. Both suck
It's that thing you do in the shower the night before the session and forget to write down "but it'll be fine" and then you forgot half of it and only remember the dumb voice you gave the shop keeper. That, plus those notes you wrote down and you're sure you knew what you had in mind but now you're not sure what "damp lich" was supposed to mean.