Choose a product you:

• Know well or just enough about
• Are passionate about - e.g. related to a hobby. If it relates to your hobby, you can speak more passionately, making your response more engaging.
• Avoid extremely mainstream products - hard to give novel insights

Keep a mix of:

• Software, hardware, products from the interviewing company

Explain why you like the product concisely:

• 2-3 minute explanation
• Leave time for the redesign portion

When asked to redesign:

• Don't just list improvements or new features
• Use the structured framework: Identify goals and constraints, map customer problems, and brainstorm solutions
• Apply all the strategies previously discussed