Designing and building websites. I spend an inordinate amount of time working on websites/web applications at every point in the process, and I like to think I've got a pretty great understanding of it in general.
Filling in the second part of my Creative Mornings nametag.
"Fake it till ya make out"
When it comes to "most" I'll have to say Elon Musk. He's founded multiple companies taking on non-trivial problems, and they're coming up with great solutions.
Navigating a crowd while lugging around a big ol' camera.
It's starting to look like photography!