This section of the Elvenware site is focused on Android from the end user's perspective. If you are interested primarily in Android development, go here:
To learn the Android Phone or Tablet OS, there are two broad subjects you need to understand:
Cloud computing is such a large topic that I have covered it in its own section of this site, which can be found here:
Additional information about mobile devices and the cloud is scattered throughout this section of the site. In particular, Chapter 02, Android Applications, is much concerned with cloud computing. If you want to learn about the cloud in general, then follow the above link to the section on Cloud Computing. If you want to learn about accessing the cloud from a mobile device, then read the material linked in the next section of this document.
The information on using an Android is available on these pages: