ISO what is it? Why do you care?

Base ISO, extended ISO. Low ISO high ISO.

Yes the lower the native ISO range the better. Cameras and sensors are better and better. Use the lowest ISO to get a sharp photo. 

This video provides insight on ISO.

I frequently use Auto ISO to control my Aperture and shutter speed choice. YMMV.

Lightroom mobile and Adobe ecosystem

In Lightroom mobile you can share your edits to others. You can also see the edits on photos others shared. When others upload photos they may allow others to remix, edit , the photo. A new image will be a copy work the new edits. There original photo is not changed. To see what is available tap the globe icon on the lower right. Select an image and tap play. Thas all I know today. But it is neat way to see what others done and may provide insights to  your editing.