What is the best method to do customer segmentation?

( Market Segmentation: How to Do it and How to Profit from It) Chapter 1-3 answer 3 question. You can follow the links here: https://ebookcentral.proquest.com/lib/wpi/reader.action?docID=1040905&ppg=5 three questions : 1) What is the best method to do customer segmentation? And why? 2) What is the Total Addressable Market? 3) Who should be your first customer? What criteria would you use to decide which customer is the best? And why?

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