edit generic product page

Hi! I need help editing a product page.

I have integrated the description part as per the guide but I need support to insert:
1.subcategory filters (i.e. all categories that are under the parent category) these can be placed in point 1 as indicated in the screen or even under the three images (in this case I will need to eliminate the sidebar which will remain empty)
2.FAQ (that I would like to appear under the products) These will change from category to category so I would need to insert them as I did with the description

I attach a diagram of how I would need the page to be clearer

thank you!