Should I focus on one customer segment or serve everyone who'll pay?
One, ruthlessly. Serving everyone means your product, messaging, and support get pulled in ten directions and you win nobody's heart. Dominate a single segment until they can't imagine using anything else, then use that base to move next door.
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A clear, operator-written guide from a respected SaaS-analytics company on defining and using an ICP to focus scarce startup resources. Practical and free.
The definitive book on picking a beachhead niche and using the bowling-alley strategy to go from early adopters to mainstream. Essential reading on why focus wins.