Pianist Aaron Tomberlin put together a great “Introduction to Piano” course that is freely available on YouTube. Each of the 14 video lessons runs about 20 minutes, and is appropriate for students ages 10 and up. You can start with the course overview video we have linked to here. These are very well done.
Aaron also has lots of other music “how to” videos, so if you like these, be sure to subscribe to his YouTube channel.