Citadel Mod for Minecraft 1.19.3, 1.19.2, 1.19.1 and 1.19, is a necessary and essential add-on to make use of some Minecraft mods, usually from the same creator. That is, if this add-on is not installed, certain mods will not be able to work at all.
In the case of installing only Citadel, it would be useless, since it would require at least another mod to be minimally functional. This is because, basically, it is a necessary link for the operation of certain Minecraft mods.
The installation is simple, since Citadel will only need to be placed in the “mods” folder, inside the game location, the well-known “.minecraft”, something that will vary depending on the executable. However, as usual in this type of cases, it will be essential to have Forge previously installed.
The use of Citadel is essential for the use of certain Minecraft mods, i.e. if you do not have this add-on installed, some mods will not work.