Many people ask me to give them a secret list of most powerful keyboard shortcuts. They think knowing more shortcuts is the same as being more efficient. Unfortunately, it is not. Read this 3 min article to understand how to find out the shortcuts you need and how to learn them in a simple manner without stressing yourself.
Every menu item has a keyboard shortcut. You don’t even have to remember it. Just press and release ALT key and it is visible. Type what you see. No need to press key combinations. Just one key at a time. That’s it. You learnt it already!
Yes. This LONG “short”cut actually works. Try it. In fact, just press Alt and choose the highlighted buttons in the Ribbon. All of them work. Just press and release Alt and then press buttons one by one. DON’T try some Yoga poses with your fingers 
With Outlook 2016, This shortcut is now Alt N AF B. This is required because it offers to attach files from local PC as well as web locations (OneDrive). It also shows recently inserted attachments.
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Shift click the Slide View (Normal button) and you can jump to the slide master for the current slide. Very useful. To come back to the slide, just click on the same icon. Very useful. First Shift click goes to the current slide – layout master. ANOTHER Shift Click takes to to the overall slide master (theme slide master). Very nice. I discovered this just now! Shift Ctrl click on it gives you only the slide. Notes and thumbnails are removed. Shift ALT click gives slide layout master without thumbnails. Another Shift ALT click gives the overall slide master without thumbnails… I am sure there is more but I am mentally saturated now 
Shift Alt Up or Down is a very powerful shortcut.
Try it whenever you need to reorder paragraphs. Does NOT work with Excel.