Google offers Android as an Operating System. And even though it has its own devices under the Nexus brand, where it uses the original version of Android, other manufacturers take Android OS and tweak it to their needs. So you have Samsung with its own version and same for others.
With so much going on with Android, it is important to have access to the support for those Android based products and the versions of the OS. So here is a useful list for all those who, like me, love the world of Google and Android!
Android OS Help from Google: Focus on Software and Hardware under the Google brand.
Android One: Guides and Troubleshooting for AndroidOne devices.
Android Wear: Guides and Troubleshooting for Android Wear smart watches.
Android TV: Guides and Troubleshooting for set-top players
If you have any other Android-based device that is from a non-Nexus line of devices. Here is the link to get access to the support and troubleshooting for all those devices.