To bring something is to carry or convey it somewhere. A trained dog will bring back a stick.
The verb bring "carries" the idea of conveying something. You might ask a friend to bring you to school, and you might bring your friend cookies as a thank you. You could bring a legal suit against someone, or bring yourself to do something unpleasant. Good fortune might bring you happiness, while a hunter might bring down their prey with one shot. The number seven is supposed to bring good luck. The slang expression “bring it” means to do your best.