Nextcloud office - templates

I have just installed Nextcloud Office. A few questions that I’m struggling with:

(1) The templates folder - is that just for my use? (With the Global Templates available for all users?)

(2) How can I set up a template such that only certain areas are editable? (i.e., protect some areas)?

(3) Are global templates editable? (It seems they can only be deleted once uploaded?)