The most important questions you can ask are the most relevant questions When you're creating your form to conduct interviews, the best work you can do is putting yourself in the skin of the potential user you're going to interview Do you get what I mean @guru_prasath ?

Here's a PDF I found to help with framing questions for user research - https://projects.iq.harvard.edu/... The document gives you a wide variety of options on how you can frame questions based on your product and use case. Hope this helps!