Modification of the existing site on 1C bitrix

We have an unfinished site on the 1C-Bitrix platform: Site Management,
Finish the work on the pages: catalog, product card, basket, personal account, ordering, delivery.

1. Set up daily catalog updates.
2. Set up the ordering sequence from start to finish.
1.1 Product card
1.1.1 The product is not added to the cart
1.1.2 1-click design doesnt work
1.1.3 Tabs do not work (equipment, characteristics, reviews, delivery, warranties, installation)
1.1.4 Products in this collection do not work.
1.1.5 Recently viewed does not work.
1.2 Shopping cart (not fully functional)
1. Product is not added, the product is removed.
2. Apply the button to change to the "checkout" button and make it working.
1.3 The checkout page is completely missing. (unregistered users can also place an order)
1.4 My Account
1. My orders (shows incorrect information)
2. Favorites (not working)
3. Return of goods (does not work)
4. Reviews (not working)
5. Personal data (shows incorrect information)
1.5 Main page
1. "Location" does not work
2. Favorites doesnt work
3. Social tabs. networks do not work
4. "Brands" dont work.

the site magus.shop, adaptive layout in the attachment.