How do I add mods to server 1.16 4?

In this way, can you add mods to an existing server?

Yes, (usually) you can do that. Not being able to would be pretty pointless, since no one sets up a whole server with all plugins and mods without ever joining it to test things before it’s set up completely. Some mods might require a new map (usually their own one), though.

Keeping this in view, how do I add a forge to my minecraft server? More videos on YouTube

Run the installer and select ‘Install server’.
Mercurius is an analytics / stat tracking mod. …
Select a location to install Forge. …
Hit ‘Ok’ and the installer will begin downloading the Forge files into the folder you have specified. …
Rename the Forge Universal JAR file to ‘custom.jar’.

Secondly, how do I add mods to my Minecraft world?

Installing Mods

Make a backup file of your Minecraft world. It’s important to save your existing world in case the something goes wrong with the new mod. …
Download Minecraft Forge. …
Download compatible mods. …
Install mods by copying the files into the /mods/ folder.
Select your mods and run them.