For example - I have ZFS running with a 5-bay HDD enclosure, and I honestly can't remember any of the rules about import-ing / export-ing to stop / start / add / remove pools etc.
I have to write many clear notes, and store them in a place where future me will find them - otherwise the system gets very flaky through my inability to remember what's active and what isn't. Running the service and having total control is fun, but it's a responsibility too