Bravery is more like a trait or an instinct. A brave person is a person who sees a dangerous situation and immediately reacts bravely without thinking.
Courage, on the other hand, is seeing a situation or a dangerous or scary experience and acting, even though you're scared.
Courage is when a person acts despite being afraid.
Courage: the ability to do something that frightens one.
Bravery is when a person acts without being afraid.
brave & courageous：
Someone who is brave is willing to do things that are dangerous, and does not show fear in difficult or dangerous situations. 一个brave（勇敢的）人愿意做危险的事情，在困难或危险的情况下不表现出恐惧。
brave: ready to face and endure danger or pain; showing courage.
He was not brave enough to report the loss of the documents.
Someone who is courageous shows courage. 勇敢的；有勇气的
The children were very courageous.