In short
- Pick the Minecraft and Forge version first: a mod made for one version does not work on another.
- Mods must be on the server and on every player's computer, in the same version.
- Take a backup before adding, removing or updating a mod.
1. Pick the Minecraft and Forge version first
Mods are built for a specific Minecraft version and its mod loader (Forge, here). A mod made for one version does not work on another. Decide the version before you look for mods, not after.
2. Same mods on the server and for every player
Mods that add blocks, items or creatures must be installed both on the server and on each player's computer, in the same version. If one is missing, the game will not let you in. Give your friends the exact mod list or the modpack you use.
3. Modpack or individual mods
A modpack is a set of mods already tested to work together, the easiest option if you want to play something specific. Individual mods give you more freedom, but you are responsible for making them compatible with each other. Most mods and modpacks are downloaded from CurseForge.
4. Memory matters more than in vanilla Minecraft
Every mod uses memory, and big modpacks need a lot more than an unmodded server. If the server stutters or shuts down by itself, check the available memory first.
Included in every Minecraft with Mods (Forge) server on LIZARION, whatever number of slots you pick.
5. Take a backup before touching mods
Adding, removing or updating a mod can break the world if another one depends on it. Take a backup before each change so you can roll back. With LIZARION backups are managed from the panel.
6. Test on your own client before inviting everyone
Join first with the exact mod list. If it works for you, it will very likely work for the rest, and you avoid the whole group losing an afternoon hunting for an error.

