The most important commercial area of the fifth avenue and where the main stores are located is the closest part to central park. In this area you will find armani or cartier store.
the most famous store is apple, known for its design as for offering computers with inccorporated wifi, something much appreciated by tourists. next to apple was the fao schwartz toy store, which was closed in July 2015.
another important commercial area that goes from washington square to the flatiron building. (We will explain in the next time that it is the flatiron building).
on the fifth avenue, in addition to shops, you will find some points of interest such as the cathedral of st. patrick, the empire state or the public library.