Pick the segment with the most acute pain, the easiest to reach, and the best path to adjacent markets after. Rank candidates by 'can I actually reach them, will they pay now, and does winning them open the next door?', then commit to one and ignore the rest for now.
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The author of Crossing the Chasm explaining beachhead selection in plain, modern language, the fastest way to absorb the framework without reading the whole book. Lenny's is a trusted operator source.
Moore's beachhead idea is the definitive case for winning one narrow segment before you touch the broader market, which is precisely how you compete when big players already own the mainstream. He argues you pick a target segment big enough to matter but small enough to lead, then dominate it before expanding. In a crowded market that focus is not timidity, it is the only way a small team gets a foothold.