One of the production crew can probably give more info, but there is a lot that gets filmed and never used. I think editing takes the most time, and don't be surprised if editing for a 5 minute video takes several hours (especially when just starting).Totally off-topic here.... But out of curiosity, how much 'film is on the floor' after editing an episode? As in - how many hours of filming happens to make a typical-length episode? My 9 (almost 10!) y/o son has started making YT videos of random stuff and he's actually pretty good at editing (even if the content is a little lacking ) but he spends a metric ton of time cutting, inserting, etc. and now he's wanting a new mic and separate camera so he can do voice-overs and floating head inserts. Curious what a professional content creator deals with to get a single episode out the door.
We're in a great era where you can get decent beginner equipment that isn't prohibitively expensive. Many consumer-grade cameras are actually much more capable than people realize. Lots of stuff can just be shot on a recent phone (I think we've got a few more casual hunts that the guys self-filmed on their phones). Even audio isn't too bad, you can use your phone as a recording device with an external mic if you want to record audio in the field.
Equipment can help make content, but it is kind of like fishing - an $80k boat won't catch you lots of fish if you don't know what you are doing. The old-timer in the rowboat will out fish you every day.
It is great that your son has taken an interest in this. It is a ton of fun and I used to make stupid videos with my friends when I was in school.