There are so many types fields that nurses can work in now, the days of always working at the hospital bed are almost ancient. A nurse can work in a hospital, in a school, as an instructor, as a case manager, in mental health, in a business, at a doctor’s office, and on an advice line. But there are different levels of certifications/license that a nurse can be. There are CNA’s (Certified Nurse Assistants), LPN (Licensed Practical Nurse), RN (Registered Nurse), and an NP (Nurse Practioner). Along with many different add-on certificates, that nurses can get.