Reddit mentions of NOLS Bear Essentials: Hiking and Camping in Bear Country (NOLS Library)

Please don’t make yourself big for a bear as raising your arms is seen as aggressive by the bear. Similarly, you don’t want to spray a bear unless it has started to charge you. Both those actions make the bear see you as a threat, and their reaction to a nearby threat can be to attack. Talk to it if you want, make sure it’s aware of you.

Assuming you’ve got your food and smelly stuff properly hung/protected and NOT in your tent, just leave it alone and go to bed. Sounds unsettling, I know, but most black bears are only interested in your food, not you, unless you scare them. Ive spent more than a few nights sleeping while a black bear sat under my food bag wondering how to get it. Biggest problem was I didn’t want to go outside the tent to pee. Human acclimatized grizzlies are a different case.

Read some of the good (not horror story) books on bears like NOLS Bear Essentials.