The videos are:

– How to shoot a Portrait selfie on iPhone X
– How to edit a Portrait selfie on iPhone X
– How to create a bouncing Live Photo on iPhone

All three are found on Apple’s official iPhone photography page. If you’ve never explored that page, take a minute to look it over. Lots of helpful tips.

This is excellent marketing on Apple’s part, the first two a subtle and, I think, effective push towards the iPhone X.