https://www.creativelive.com/class/using-smart-objects-in-adobe-photoshop-2020-ben-willmore

Learn To Work Non-Destructively

AFTER THIS CLASS YOU’LL BE ABLE TO:
Determine when Smart Objects should be used and when they are a bad idea
Non-destructively scale, rotate and warp
Create templates with easily replaceable images
Use linked Smart Objects across multiple documents
Retain camera-generated raw data when opening an image in Photoshop
Create multiple instances of a Smart Object and have them all update when you change the original

WHO THIS CLASS IS FOR:
Beginner, intermediate, and advanced users of Adobe Photoshop.
Those who want to gain confidence in Adobe Photoshop and learn new features to help edit photos.
Students who’d like to take ordinary images and make them look extraordinary with some image editing or Photoshop fixes.