So, the official documentation can be found at: https://docs.cardano.org/en/latest/
You probably already know, but I still like to mention that cardano-node has nothing to do with Jormungandr anymore. Please, don’t look for Jormungandr docs.
Most likely you will make faster progress with instructions listed here: Useful resources to run a Stake Pool (also good to know: Haskell node is a synonym for cardano-node)
In addition, there is a super-active group good for searching error messages and such here: https://t.me/CardanoStakePoolWorkgroup