The 'Discover' feature shows you the work of (Adobe selected) Advanced editors as it steps you through the exact steps they took to edit the displayed photos. They are like tutorials on the techniques to achieve the 'look' of the displayed photos.
You will note they are by Lightroom Experts like- Martin Evening, Chris Orwig, Julianne Kost, Nick Rains, etc.
The interactive "Learn" section involves you in the edit process using the provided images as the sample to edit.
You would not have your photos show here unless you could submit your credentials to Adobe and have them accept your tutorial.
This feature just makes instructional 'videos' more readily available to Lightroom users.