to improve knowledge

I also do not quite understand what you are looking for. You want to increase your knowledge about what?? Nursing?? Nursing is a very demanding field that requires physical, mental, psychological stamina and higher levels of education. It requires the ability to smile when someone offends you, to provide a loving touch when your patient is screaming. To know what to do in any emergency and do it with calm. It requires the ability to perform with sleep deprivation, maintain professionalism with upper management, and ability to be proactive with patient care. The hours are long, the career is rewarding and you can make a difference in many lives.