I prefer to install Fabric, Iris, and Sodium manually as described here:
GitHub: Iris Docs - Manual Installation

Fabric

Mods

These are just client side mods, no need to install them to join the server.

Shaders

Resource Packs

Server Mods

These are running server side, no need to install on the client.

The server is running Fabric 1.20.6 with the following mods:

Forge

Forge Installer 1.19.2