What is the best approach for multi categories filtering I need a solution for a good filter approach in Craft.

I used 3 Categories related to an entry (Project). The 3 Categories are
(Type / State / Location)
How do I have to set up the routes for the multiple slugs?

Example:

example.com/project/office/finished/germany.


I already fetch projects with AJAX for one category, but it should also work with a combination of categories.
You could leave the Category URI Format blank in your settings and set an advanced route in config/routes.php like so:

'projects/&lt;type:{slug}&gt;/&lt;state:{slug}&gt;/&lt;location:{slug}&gt;' =&gt; ['template' =&gt; 'projects/index'],


Which would make {{ type }}, {{ state }} and {{ location }} available as variables in your template.