Tell me about breeding.

Thank you for your reply.

I referred to the video, but it didn't work well because the video is old. (I get an error).

I would appreciate it if you could post a picture of the procedure if possible.

Also, I would like to see a procedure where the Mob follows you when you are holding an item.

I have looked into this, but I am having trouble with the NBT Tag causing an error when I create my own.

The breeding of custom mobs comes up, but I can't find a way to breed or attract existing mobs.

Does anyone know how to do this?

I am using automatic translation, so if you could give me a picture of the procedure or steps, that would be great.

As for breeding, I can do it by entering commands.

Command 
breeding 
/data modify entity @e[type=cow,limit=1,sort=nearest] InLove set value 600

Particle 
/execute at @e[type=!player,sort=nearest,limit=1] run particle minecraft:heart ~ ~ ~ 0 0 0 0.1 10

However, at this stage, it is not a case of clicking on the target Mob. It only reacts to the nearest Mob.

I would like to make it so that it reacts when clicked on the target mob.

It would be helpful if you could post the rest of the procedure with an image (for automatic translation).

Translated with DeepL.com (free version)