When it grizzly country, I've always followed the "rules" about hanging things upwind and in a tree and even some things under water...you've read all that. I've not been so careful in country only inhabited by black bears. I've never been bothered but did have a black bear "wandering" around camp late one night.
My son, playing with a coyote call while sitting around the campfire, called a mountain lion to within 100 yards of camp one night....it wandered back and forth (just inside the brush) for a VERY long time.
I was once attacked by a black bear. I was elk hunting and away from camp. It stalked me and charged. Fortunately, I saw him coming in time; just wasn't at camp.
In addition to hanging things in trees and all that, I'm a BIG believer in bear spray. I think bear spray is better than guns, because it's easier to miss with a gun than with the spray. I've seen what the spray does and have great confidence in it.
Within the shadows, go quietly.