Each modded server requires the same mods to be installed on the client-side as well. To easiest way to manage these modpacks / mods is through a launcher such as the CurseForge App.
Modded servers allow you to add custom textures, features, and so much more to the game. There are tens of thousands of premade modpacks which consists of hundreds of mods to enhance the gameplay with you and your friends.
You can download thousands of modpacks on your server with a simple click, through the Game Panel’s built-in Modpack Installer. Here’s a guide for that:
How To Install Modpacks On Your Server?
This article shows you step-by-step on how to install a modpack on your server.
Different Modded Versions
The most commonly used Minecraft versions that allow mods are Forge, Fabric, and NeoForge. Each mod that you download is designed to work on one of these versions and you cannot download Forge mods on Fabric servers for example, and vice-versa - Forge server only accepts Forge mods.
This also applies to mod versions, they are made for specific Forge versions. If your server is running on Forge 1.20.1, the mod must also be made for Forge 1.20.1.

Client-Side and Server-Side
Some mods are made for only the client-side which cannot be installed on servers, and same with server-side mods - they cannot be installed on the client-side. These are pretty nicely shown on Modrinth.


Mod Dependencies
Mod dependencies are additional mods that are required for a mod to function properly. There are different types of dependency mods, such as;
Mod-specific Libraries
Core Mods
API mods
These are pretty nicely mentioned on Modrinth.
