When it comes to where you download your Modpack from, there's several sources you can choose from such as Curseforge directly, Technic Launcher, Voidswrath, MultiMC and others, we'll be recommending you first install a Modpack using the CurseForge Launcher as it has some of the most popular packs available and tends to be quite user friendly for beginners. Installing a Modpack using the CurseForge launcher (Recommended for beginners) If you've already got a server Modpack, you'll want to install the same one on the client in order to join.
If you're looking to install the Modpack on the server, we already have a video guide on that process. A Modpack is a way of adding additional content, features and game play improvements to your game without having to manually configure and tweak individual mods, you have many play styles and environments to choose from that creators have already got ready for you to explore, we'll be guiding you through the set up process of a Modpack on the client-side.