If you are tired of playing the vanilla version of Minecraft on your server and want to try something new, consider installing some mods. Doing so will enhance the Minecraft gameplay experience and bring something completely new.
This tutorial will show you how to install the Forge add-on and upload mods on an already existing Windows, macOS, or Linux Minecraft server. We will also cover the differences between Forge and mod launchers to help you decide.

Sites for you knows how to install mods on your Minecraft
https://multimc.org/

https://prismlauncher.org/