Google has revamped and completely overhauled the android developers website developer.android.com For all these days this website being the one stop shop for developers to learn about android versions,api’s,SDK and references.
The website has been completely redesigned and filled with entire new content that really helps the newbie developers right from scratch.
Android design section will feature the in depth description on various design principles, user interfaces,design patterns to create user friendly apps.
This section is very helpful for android developers to learn about various API’s,references and other information that are helpful to code android apps.(Example: What is an android activity)
Here comes the business end of the development.Once you developed the application you need to publish on android play store.This section helps to learn app publishing and promoting.