The best way to support is by purchasing through the recommended links (Lulu or the official store) or by recommending the book to others. At third-party retailers, the author’s earnings are significantly lower.

Since print-on-demand produces each copy individually, delivery times vary by country and retailer — typically between 5 and 14 business days.

The book isn’t mass-produced — each copy is printed on demand per order. Platforms like Amazon KDP and Lulu keep 40–60% of the sale price. In addition, the content is highly condensed, giving you directly applicable developer knowledge instead of lengthy, filler-style reading.

Digital products (downloads) are non-refundable and cannot be returned. For printed editions, the seller’s return policy applies (e.g., Amazon or Lulu).

When buying via Lulu or the official download store, the author receives a fair share of the proceeds. At other retailers, the author often earns only a minimal commission, even though production and investment costs remain the same.

With print-on-demand, no human checks each individual copy. Therefore, slight variations in color, trim, or spine alignment may occur — these cannot be guaranteed. In cases of significant defects (e.g., severe color deviation or crooked spine), please contact the retailer’s support team — a replacement copy is usually provided. Digital downloads are excluded from this policy.

No. The book is intentionally not written like a novel. Its content is highly condensed, technical, and practice-oriented — featuring lists, structures, code examples, and no unnecessary filler text.

Yes. Every reader gets access to a download bundle with additional files and practical resources.

No, support is not provided for the book or its code examples. However, feedback and improvement suggestions for future volumes are always welcome.

The book is available as a hardcover, softcover, and digital download (PDF / EPUB). Available formats may vary depending on the retailer.

The first volume is published in German and English. The Spanish edition is currently in preparation and will be released separately.

In many cases, yes — if it’s used for professional purposes (e.g., training, agency education). Please note that individual tax regulations may apply.