Information Gathering - Active Subdomain Enumeration

Hey guys, I dont know why I cant get to grips with these questions. I have been stuck on these questions for around a month and just gave up to complete the bug bounty modules, however after finishing them I need to complete these.

Putting it in plain English, I have 0 clue where to go after the zone transfer. The last 2 questions I have just guessed but these ones I have no clue. I am in need of help desperately