These are the methods for editing/adding an entity's tags, listed in order of priority, from highest to lowest. Before anything else, here is the configuration for the entities.
Principal config (yml)
enabled:true# if false => tags will not work.translation:x:0y:0z:0tags:# check tags' folder.-hearts/normal-style-normal/custom-name
UUID
Edit/add tags by UUID. Go to the πentities/uuid folder and add a file with the entity's UUID (You can obtain the UUID by running the command /tagit get uuid, check Commands & Permission).
Edit/add tags by mob. Go to theπentities/mobs folder. There, you will find a file named general.yml. This file applies to all mobs and serves as the configuration for mobs that have not yet been specified or configured individually.
mobs folder
MythicMobs
Edit/add tags of an entity of MythicMobs. Go to the πentities/mobs/mythic-mobs folder and create a file with the name provided by MythicMobs for the entity. For example, SkeletonKing.yml. This configuration will then apply to all mobs with that name.
Edit/add tags of an entity by its type. Go to the πentities/mobs/type folder and create a file with the name of the entity type. For example, zombie.yml. This configuration will then apply to all mobs of that type.