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I've been using Duolingo for some time and I wasn't aware there are grammar notes. How do I see them? I can't find them. I'm using the Android app.

They are easy to miss, I had them pointed out to me when complaining about no formal instruction in the app.

Click on of the lession categories on the home page, and it will give a drop down. Then pick tips

Know if there a way to access these tips from the iPhone/iPad app?