Objects which can be deleted and which cannot be

Summary

Is there a document or list which tells me what objects can be deleted and what not

Content

Hi,

Interested to know what person related objects can be deleted and what cannot be.

Example such as : person (cannot), phone can, email can,

It would be good if someone has the comprehensive list which tells what can be deleted using HDL/API.

Need to GDPR incase person raises a request to be forgotten.

thanks in advance.