Use case
In a collectibles site, user can choose an item and add it as many items as they wish to their collection.
Then, user can access a page that lists the items they own, and for each item user can enter price, source, condition, and date of ownership.
I don’t want to use a commerce module or distribution, as this is the only product-like feature I need in my website. Which subjects I should look at to build this capability myself with Drupal 9?
