will help you to finish quickly.
bind a skin
Primary skin joint.
early stage for skinning, you only start with Primary.
select your mesh → click the icon
It will bind on joints which it has this tag - attribute name is a skin_joint.
add joints
Secondary skin joint.
add joints for extra influences.
For example,
Ribbon joints, Extra joints to tweak shape of assets
select your mesh → click the icon
It will add influences when you turn off.
