AmyMythicMobs has [a lot of commands]. While all of them are useful in their own right, you might want to know about the more useful ones before diving in, and this guide is here for that exact purpose!
Reload the plugin
/mm reload
Without reloading, all the changes you may do will not be applied!
Essentials
Spawn a mob
/mm mobs spawn [mobtype]
Allows you to spawn the specified mob
Remove a mob
/mm mobs kill [mobtype] To kill the specified mobtype
/mm mobs killall to kill all non persistent mobs
/mm mobs killall <radius> to kill all non persistent mobs in a radius
Get an item
/mm items get [itemname]
To get the specified item
Utility
Debug Level
/mm debug [level]
Ahhhh, the one and only debug command! It allows for more information regarding mechanics and events that are being executed to be printed out in console, based on the level argument passed to it (using /mm debug 4 will enable debug message "up to level 4" to be displayed, while /mm debug 0 will disable all debug messages)
Listactive
/mm mobs listactive <mobtype>
Allows you to list all the active mobs, optionally filtered by their mobtype, and to obtain further information for their entry, teleport to them or kill/remove them
Get Coordinates
/mm utilities getcoordinates
Allows you to get formatted coordinates of your position and the one pointed and the target's
Get Item Info
/mm utilities getiteminfo
Allows you to see all of the nbts present on the held item
Get Path
/mm utilities getpathstring
With this command you can place blocks and obtain a list of coordinates you can use in patrol aigoal or similar instances
List All Entities
mm utilities listallentities <radius/mobtype>
Allows you to list all entities, enabling you to filter them by the distance or their type