There’s a sentence about mid-way through the section that says:
We also want to add some additional security precautions to our view to make sure that we let non-owners edit information that isn’t theirs.
My guess is you meant:
We also want to add some additional security precautions to our view to make sure that we do not let non-owners edit information that isn’t theirs.
Or, perhaps:
We also want to add some additional security precautions to make sure only the owner of a Thing can edit their Thing.
By the way, thank you for sharing your knowledge and experience in such an accessible way!