For 6.34, I think it mainly means legal financial responsibilities - things like joint mortgage, joint loans, joint credit cards etc. - things you are both legally responsible for paying.
However, some people list things like jointly paying rent and bills too.
If he has no money to contribute to any expenses at the moment, then just put that.
Sorry about not being able to get an appointment - most people book theirs before they even start looking at the application form or gathering all their documents.
For a while, the only way to even get an appointment was to book at midnight exactly 42 days before you wanted the appointment - because third parties were buying up all the appointments and then selling them on for higher prices. UKVI put a stop to that and since then there have been no real issues getting appointments, but they do book up if you wait too long.
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