The server creates itself on the first launch, next to the jar file, in the same folder as ops.json and the world folder. It's a normal text: row of view ключ=значениеI don't know. The server reads it on launch, so when it's rebooted, they reset it. The default values are exactly what the Minecraft 26.3 server itself writes.
Collect the entire file, with ready-made sets for friends, survival or anarchy, - in server.properties generator. Who can use what commands? operator level.