This document discusses guerrilla validation, which is a method for validating a product idea with real customers in a short period of time with no budget. It recommends getting the product concept on paper quickly, then getting out to test it by finding potential customers through your own network, online, and by contacting them directly. The key is having conversations to understand if customers have problems your idea could solve and if they would buy it. Ten conversations can provide valuable insights to determine if the idea is worth pursuing further.