Stand left, walk right on escalators and moving walkways
This may be region-specific. In my area, I generally see it the other way around. But unless you're the only person, it's usually pretty clear which side to stand.
Treat yourself like a car and park - I see too many people just stopping in the middle of wherever to check their phone. It's not hard to take a quick glance and find a spot off to the side. They should teach this stuff in schools.