This new book series takes the reader from no knowledge of Unity to reasonable levels of proficiency. It consists of three books: Foundations, Beginner, and Advanced.
It includes step-by-step instructions that should be ready helpful to those new to Unity or to Game Development.
The books are sold for an affordable price of 5$ each, and are available in several formats, including: Kindle, pdf, pr paperback.
You can find more information on these books here.