Bronchitis is a inflammation of the lining of bronchial tubes, which carry air to and from the lungs.
Some causes include other viruses like the flu, or some sort of bacterial infection along with smoking, and air pollution. However Bronchitis is not contagious so you can not get it from other people that have been exposed to Bronchitis.
Some signs and symptoms can be an ongoing cough, production of mucus, which can be colored weird and rarely it may be streaked with blood, energy loss, shortness of breath, slight fever and chills, chest discomfort all of these could lead you to think you have Bronchitis.
Some treatments for Bronchitis can be cough medicine or antibiotics can be recommended. Otherwise there is not much you can do to help Bronchitis except rest especially rest your throat.
To prevent Bronchitis stay away from air pollution, and don't smoke. The polluted air can cause you to cough/ get sick which can lead to Bronchitis. Overall if you maintain a healthy lifestyle and drink plenty of water, and wash your hands then you should be fine.