I have a content tagged by two taxonomy vocabulary ( location and category)
How can I let the user select the
location then select the
panel) will show the contents tagged with both terms
In Views you can do it with Exposed filters.
Just add filtering by your two vocabularies to your view (FILTER CRITERIA) an set each filter "Expose this filter to visitors, to allow them to change it". That will show form to enter taxonomy tags to filter on views page. AND logic "show the contents tagged with both terms" works by default (set each exposed filter to "required" if you dont want to allow "all", that way user must select something).