#1
I've read up on every tutorial I can find. It might be my single digit IQ level, but I'm confused about how to structure the searches. 

I've got the basics down. So I understand that you search google/duckduckgo/bing/etc using dorks to find specific keywords, pages, files, etc. within a website

I managed to find an admin page on a taxi website and SQLi'd into it, but I want to target my attack to specific websites within a niche.

How would my search be structured if I want to find vuln websites in a specific niche?