Match the channel to how people already look for what you sell: intent-driven search for problem-aware buyers, feed-based social for discovery and impulse. Use Traction's Bullseye method: brainstorm every channel, cheaply test three, then double down on the one that works. Don't spread a small budget across five channels.
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When you have no budget, the worst move is to pour your limited time into a channel that was never going to work for your product. Traction gives you all nineteen ways a startup can reach customers and a simple way (the Bullseye framework) to bet on two or three worth testing first. Treat it as a menu and a method, not a verdict: your free channels will come from this list, you just have to find the ones that fit you.
A blunt, practical guide from Demand Curve's founder on which paid and organic channels fit which business, and why most startups can't profitably buy ads early on.