How long are the books?

Whether you're looking for a quick read or an in-depth guide, you can choose from four book lengths:

• Comprehensive (250-300 pages)
• Detailed (150-200 pages)
• Essential (70-100 pages)
• Short (30-50 pages)

The book lengths above are an estimate based on tablet-sized pages. When reading the book on a mobile phone, it will have more pages, and when reading the book on a high-resolution computer display, it will have fewer pages.