[gIWnXYkw]

As long as you ask open questions (who, what, where why, how, when) that are relevant and specific, you usually get a decent answer.

Avoid questions with yes or no answers, or conditional questions like "Can you give an example?" instead say "Give an example".

Avoid multiple questions in a single run.

Use pauses, it makes the other person want to speak to fill the gap.