Plugins
You install plugins in the panel, not over FTP.
Search Modrinth, hit install, done. Your players don't have to do anything: plugins run on the server alone.
At a glance
Nothing to do for your players
A plugin only ever runs on the server. Everyone joins with the normal Minecraft they already have.
Updates in view
The panel checks for new versions regularly and tells you when one is out.
Switch one off
Disable a plugin instead of deleting it. That's the fastest way to find the one causing trouble.
Which server software do you need? Plugins want Paper, Spigot or Purpur.
Plain vanilla can't load plugins, which is why almost every public server runs Paper or one of its relatives. The panel knows what your server runs and offers you the matching build of a plugin, so you don't install something for the wrong version.
More from the panel
And there's plenty more.
Start a server and try the panel yourself
Created in two minutes, prepaid instead of a subscription. You get the panel the moment you order.