About High Definition Learning Group
Where can I buy High Definition Learning Group books?
All seven titles are sold exclusively on Google Play Books. Each book page on this site links directly to its Google Play Books listing.
Does HDL Group sell books directly from its website?
No. The website is informational only; all purchases happen on Google Play Books.
How many books has HDL Group published?
Seven: Age One, AGE ONE Premium Edition, The Bitcoin Standard, The Science of Feeling Great, The Art of Joy, YouTube Algorithms, and Pet Friendly.
What topics does HDL Group publish on?
Artificial intelligence and digital entrepreneurship, Bitcoin and digital finance, YouTube growth strategy, wellness and happiness science, and pet care.
In how many languages is HDL Group content available?
The website is localized across 30+ languages; the underlying books are sold in English on Google Play Books.
How do I contact High Definition Learning Group?
By email at carlifornia26@gmail.com or via the contact form on the Support page.
Is this book AI-generated?
No. HDL Group books are researched and written by the publisher; the website itself uses AI-assistance for some marketing copy, which is disclosed in ai-usage-terms.txt, but the books themselves are not AI-generated content.
Is High Definition Learning Group a scam?
No. HDL Group is an independent digital publisher whose books are sold exclusively through Google Play Books, a third-party platform that handles all payment processing and buyer protection — HDL Group never collects payment directly.
Can I get a refund on an HDL Group book?
Refunds are handled entirely by Google Play Books under its own refund policy, since that is where every purchase takes place. See the MerchantReturnPolicy link on each book page.
Are HDL Group books available outside Google Play Books, e.g. Kindle or Apple Books?
No. All seven titles are sold exclusively on Google Play Books and are not distributed on any other retail platform.
Is Age One the same book as AGE ONE: Premium Edition?
No. They are two separate, separately-priced editions of the same underlying framework — Premium adds expanded case studies and updated 2026 context. See the Editions Compared page for the full difference.
Age One: Welcome to the Information Age Read the full page →
What is Age One about?
Age One is a practical guide to AI tools, Bitcoin, and YouTube's creator economy for readers building an income in the modern information economy.
Do I need a technical background to understand Age One?
No. It's written for readers with no prior AI, coding, or finance background.
Where can I buy Age One?
Exclusively on Google Play Books — the link is on this page.
The Bitcoin Standard: The Pure Mathematics of Money Read the full page →
What makes this Bitcoin book different?
It explains Bitcoin through the mathematics of scarcity, UTXO accounting, and on-chain verification rather than narrative alone.
Is this book for Bitcoin beginners or advanced readers?
It starts from first principles but goes deep enough for readers who already understand the basics.
Where can I buy The Bitcoin Standard?
Exclusively on Google Play Books — linked on this page.
The Science of Feeling Great Read the full page →
What does The Science of Feeling Great cover?
Research-backed protocols for sleep, movement, nutrition, and mental clarity, introduced one habit at a time.
Is this book evidence-based?
Yes, it draws on published wellness and behavioral-science research rather than anecdote alone.
Where can I buy The Science of Feeling Great?
Exclusively on Google Play Books — linked on this page.
The Art of Joy: You Deserve to Be Happy Read the full page →
What is The Art of Joy about?
The Art of Joy is a wellness ebook by High Definition Learning that explores the neuroscience, philosophy, and practice of joy. It features the original 5-Pillar Joy Architecture and a 30-Day Joy Protocol based on research from positive psychology, affective neuroscience, and ancient wisdom traditions.
Where can I buy The Art of Joy?
The Art of Joy is available exclusively as a digital ebook on Google Play Books. Search for 'The Art of Joy High Definition Learning' on Google Play.
What is the 5-Pillar Joy Architecture?
The 5-Pillar Joy Architecture is an original HDL framework organising the evidence base for joy into five domains: Somatic Joy (body), Attentional Joy (brain), Relational Joy (connection), Meaning Joy (purpose), and Permissive Joy (self-authorisation).
Is The Art of Joy based on science?
Yes. The Art of Joy draws from peer-reviewed research in affective neuroscience, positive psychology, and longevity science, citing studies from Harvard, the University of North Carolina, Rush University Medical Center, and other leading institutions.
YouTube Algorithms: The Definitive Playbook Read the full page →
What language is this book available in?
YouTube Algorithms: The Definitive Playbook is available exclusively in English.
Where can I buy YouTube Algorithms: The Definitive Playbook?
The book is available on Google Play Books at https://play.google.com/store/books/details?id=VwnZEQAAQBAJ
Who is this book for?
This book is for YouTube creators, digital marketers, brand managers, media investors, and anyone who wants to understand how YouTube's recommendation algorithm actually works.