What is actually worth asking at the end?
Concrete process questions: how the last incident went, how long the last change took from merge to production, what happened to the previous person in this role. Culture questions get culture answers; process questions get facts.
How do I answer the expected salary question?
With a range anchored on evidence, and the question turned around first: asking what the band for the role is costs nothing and is answered honestly more often than people expect. If the answer is refused, that is information too.
Does this still hold if I am working alone?
It gets easier, not harder. A fair share of the difficulty is coordination, and that disappears. What remains is remembering your own decisions, which is what writing them down is for.