WorldGuard

What It Is

WorldGuard has a host of functions for server owners, server map makers, regular survival servers, and everyone else in between.

• Create zones in your world that only permit mods or certain players from building within
• Set additional game rules on your server (deny wither block damage, falling damage, etc.)
• Set game rules on specific areas (food regen, health regen, disable PvP, TNT, control mob damage) in your world
• Blacklist certain items and blocks so they can’t be used
• Add useful commands like an immediate “STOP ALL FIRE SPREAD” command.
• Protects against many types of abuse (tree growth, TNT cannons, piston machines, etc.)
• Certain interactions can also be allowed (door and lever usage, etc.)

https://worldguard.enginehub.org/en/latest/index.html

Useful Commands

Check out their documentation for details on how to use it. My primary use was to protect the players' homebase areas and the WorldHub area.