Minecraft Java Edition can be modified with plugins if you’re running the community made Modloader Spigot or any of it’s forks suck as Paper or PurPur. We’ve created a few guides about some important plugins that are common to install on servers.
CoreProtect
DriveBackupV2
Chunky
BungeeGuard
LuckPerms
Votifier
SquareMap
BlueMap
Geyser