No chart in the world can help get rid of your 20,000 unread emails on Gmail. That's all on you or the Mailbox app.
There is a chart from Visual.ly, created by Visualeks, however that offers a plethora of tips, tricks and shortcuts that will optimize your Gmail experience. Did you know that can browse through your Gmail messages and contacts without ever really using your mouse?
Familiarize yourself with some of these keyboard shortcuts and you'll be navigating your Gmail at hyperspeed in no time.