How to organize data filtering in asp.net core mvc application?

Question

HTML

Hello! I am developing an online store using ASP.NET CORE MVC. I use the site metanit. Little development experience. When loading the main page, I display cards of all products and something like on this page https://metanit.com/sharp/aspnet5/8.2.php On the form I have four drop-down lists, the data source of which is product categories. When I fill in all four fields with categories and hit submit , everything works fine, the filtered cards are displayed. Now I need that when entering data into one of the fields, the data sources are automatically filtered in the drop-down lists of the remaining fields and a "show" link and the number of positions are formed next to it. I saw such filters on many sites, for example https://www.1001tur.ru/ I want a list with checkboxes to drop down on a click on the field and I could make a multiple selection of categories. And at the same time, when selecting items in one field, checkboxes in other fields would be automatically filtered out.

Answer 1

Personally, I did not understand. Describe for yourself to understand the process.
In theory, you can create a controller that will give data sets, respectively, after some actions on the client, you give a new data set, or if there is enough data, do everything on the client.