Object Type Details Where is the document or detail described?

I am looking for documentation on object types.
It is difficult to understand the implications of configuring policy access control rules.
I think roughly the WTDocument is the basic document.
To configure policy access control rules, you need to know what the object type is.
So I need an explanation of what each object type is.
Give me a link or document for the object type.

thank

p.s

I do not need an object description like the picture below.

When creating policy access control rules, as shown in the figure below, please let us know what each type controls (eg WTPart, the type that controls the permissions of the part).