GeckoLib Mod for Minecraft 1.19.3, 1.19.2, 1.19.1 and 1.19, is a necessary and essential add-on to run some Minecraft mods correctly. That is, certain mods will not be able to work as long as this well-known add-on is not installed in the game location.
As it is logical, in the case of only having GeckoLib installed, it would not have any type of utility, since it will necessarily require another mod to be functional. Basically, it is a binding necessary for the operation of certain additional features of Minecraft.
In fact, the installation is quite simple, so it will only be necessary to place GeckoLib in the game location, specifically, in the “mods” folder. This folder may not exist initially, so it will be necessary to create it, but the rest of the desired mods will be placed in the same place.
GeckoLib is commonly used to make certain features of some Minecraft mods work, i.e., its installation will be mandatory in certain cases.