How to make such a filter and what you need to know to implement it?

Question

Online shopping

Hello.
How to make a filter like on this site?
residential-krasnodar.rf

What programming languages ​​do you need to know. Are there ready-made options?

Answer 1

You need to know JS, well, what is the backend on, usually PHP. (+ working with the database, of course, you also need to understand the layout and how the web works in general) As a
rule, almost all CMS for online stores have a ready-made filter solution.
Quick catalog filter for online stores on ...