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The best questions to ask are those which help you to assess a firm against your personal criteria. Figure out what really matters to you in a firm and ask questions which seek to elicit this information to see if the firm befits your criteria or not. There’s no right or wrong with questions, though there are some questions where the answer might easily be searchable and found online so, as [USER=1]@Jaysen[/USER] said, be sure to do a little research first to make sure you understand the basics of a firm