The only piece of advice I can share that helps one become a better traveler is: Pack as Light As You Can!
Seriously. Take only what you need and even a little less. Strive for only one carryon bag. Makes the experience SO much more enjoyable. Even a few pounds/kilos makes a huge difference.
Unless you’re going to the jungles of Borneo, there’s always a store nearby if you forgot/need something.
