Let's be very honest, a programming language cannot be learned in "one day" or "fast". You will need lots of examples and practice to learn C#, especially if you are beginner. Beware of other shorter books that only touch on the topic and do not provide enough exercises or examples.
This book was designed to make concepts as easy as possible, while explaining how programming works. This guide is different from others in that it includes a variety of different exercises that readers can learn from.
You no longer have to waste your money on books that are are only 200 pages and do not deliver enough value. You deserve better.