You need to remember that both your server-side software and your local PC/laptop software have to be running the same versions of the game, or close enough versions that will allow them to communicate with one another. Some games will not tolerate version differences at all.
If you choose to add Plugins/Mods to your server, be aware that there are literally thousands of them available!
Some Mods are very old, and no longer receive updates. They may not work with the latest version of the game.
If you find a newer version of a Mod you are using, make sure you remove the old version first.
Not every Mod is compatible with every other Mod. Combining mods may cause issues that are hard to isolate.
Some Mods rely on other Mods, but mod documentation may not tell you so (it there is any).
The more Mods you add to your server, the more resources (disk space, cpu, and memory) they use. This can impact server and client performance.
Some games allow you to download Mods from the server to your local PC/laptop. Others require you be “subscribed” to the Mod, or have the Mod installed locally before you connect to the server. If the Mods are large,...