#1 Bestseller

The Six-Figure Second Income

How To Start and Grow A Successful Online Business Without Quitting Your Day Job

by David Lindahl & Jonathan Rozek · Published by Wiley (2010)

About the Book

I wrote this book with Jonathan Rozek after we'd spent years testing what actually works for building online income. Not the theory — the actual hands-in-the-dirt, spending money on ads, watching what converts version.

The title sounds bold, but here's the honest version: we ran the tests, made the mistakes, and figured out what worked. This book is the shortcut I wish I'd had when I was trying to build income streams alongside everything else.

The same systems thinking I used to build a real estate portfolio — build it once, let it run — applies directly to online business. Once you understand the framework, you can build income streams that don't require you to be present every day.

This isn't about getting rich quick. It's about building real assets. Same philosophy I've always used — just applied to the digital world.

What You'll Learn

Finding Your Niche

How to identify profitable online opportunities that match what you know and can do well. Not every niche works — we'll show you how to vet them before you spend money.

Building Your First Product

Information products, courses, reports — how to create something people will pay for, even if you've never done it before. You don't need to be an expert. You need to be further ahead than your audience.

Traffic and Marketing

The strategies that actually drove revenue — not the ones that looked good on paper. We tested email marketing, paid traffic, SEO, and partnerships. Here's what worked.

Automation Systems

How to build funnels and systems that generate income while you sleep. The goal is a business that runs on autopilot — not one that requires your full attention every day.

Going from Side Income to Six Figures

The path from $1,000/month to $100,000/year — what changes at each level, what you need to invest in, and how to make the jump without quitting your job to do it.

Real Case Studies

Actual examples from David and Jonathan's businesses — not hypotheticals. What they built, what they spent, what it returned.

Who This Book Is For

✓ You have a day job you can't quit yet

This book is specifically designed for people building on the side — not full-time entrepreneurs. Every strategy works around a 9-to-5.

✓ You want systems, not hustle

If you're looking to build something that runs without you, this book shows you how. Hustle has a ceiling. Systems don't.

✓ You want real tactics, not theory

David and Jonathan tested everything in this book. It's not inspirational fluff — it's what worked, documented.

✓ You want to build something real

This isn't about making a quick $500 flipping stuff online. It's about building assets that compound and pay you for years.

What Readers Are Saying

"Finally a book that gives you a clear roadmap instead of vague inspiration. I went from zero online income to my first $3,000 month within six months of reading this."

— Amazon reader review

"David applies the same systematic thinking he used to build his real estate empire to online business. The parallel is powerful and practical."

— Business reviewer

About David Lindahl

David Lindahl has built businesses from scratch twice — once in real estate, building a portfolio of 9,000+ apartment units and $240M+ in property, and once in education with RE Mentor, the #1 multifamily education company in the U.S.

The principles in this book came from his own experience building information products and online systems alongside his real estate work. He's a 4x #1 bestselling author — Donald Trump personally selected him to write Trump University Commercial Real Estate 101.

He's been featured in Reader's Digest, Kiplinger Magazine, and AOL Real Estate. He's also an Iron Man triathlete who trains 10x per week, which tells you something about his approach to building things that don't take shortcuts.

More About David →

Get Your Copy

Available in paperback, Kindle, and audiobook formats.

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