Doing some research about android standars and guidelines I came across these github repo with a really valuable links:
Called: CodePath Android Cliffnotes
Welcome to the open-source Codepath Android Cliffnotes! Our goal is to become the central crowdsourced resource for complete and up-to-date Android content and tutorials. Just take me to the notes!
Actually I have joined the community and I have started adding content in the wiki page for the CodePath for android. My first contibution was adding information about Realm database framework and Swagger, two of my favourites libraries.
:)