ranjit I've also heard that adult beginners tend to worry about technique and theory too much.
It's this piece of advice that I think is highly misleading. I'm not so concerned about the theory part -- you can learn piano well without knowing much theory. But technique should be learned very carefully, so I disagree that adult beginners worry about technique too much.
IMO videos are way better at teaching technique than books. If you're learning kung fu, would you read about positions from a book which doesn't even have images, or would you watch an hour-long demonstration video on YouTube? I would say the same principle applies. (I recommend Denis Zhdanov btw.)