This book talks about all aspects of Go custom generics. The contents mainly include
(about 50 pages)
Tapir, the author of Go 101, has spent 5+ years on writing Go 101 series books and maintaining the go101.org website. New contents will be continually added to the book series and the website from time to time. Tapir is also an indie game developer. If you would like to, you can support the book and the website by playing Tapir's games (made for both Android and iPhone/iPad).
Thanks to Olexandr Shalakhin for the permission of using the wonderful gopher icon images in the book cover.