Notes from 20 years of building real online businesses.

Before you start another business, see how the money actually works.

This is not a quick read. It is a practical, numbers-first breakdown of how the businesses I've built since 2005 actually work: the models, margins and decisions that determine whether a business makes money.

• Where the money comes from in ecommerce, affiliate marketing and digital products
• The numbers that determine whether a business can become profitable
• The mistakes that cost me years, and how to avoid repeating them
• What to build first, what can wait and how the pieces fit together

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