Rookie Question: How many bones are required for a Humanoid Animation Set?

Just as the title says.
Every time I add the needed bone to a model via Blender, it comes up with another one that is required. I have searched for a list of all the required bones, but could not find one.
Does one exist?
Thanks!

 

In this context what does IT stand for? More info needed to help. What type of setup are you trying to Create? The more detail the easier it will be able to assist.

 

My bad. "IT" is the error message that appears, saying that it cannot give it Humanoid Animations, as it is missing a certain bone. I know how to add and delete them in Blender, but I do not know how many are required.

 

If this is for a "normal" humanoid take a look at the free models for unity.
There are tons of random humanoid creatures out there that have a full "mecanim ready" rig.

Example:
https://assetstore.unity.com/packages/3d/characters/humanoids/fantasy-monster-skeleton-35635

The bones don't have to have special names as long as you strictly adhere to the T-Pose so unity can figure it out from bone-length ratios and angles and so on.