"I am a man."
Translation:Jeg er en mann.
NTNU has a good read about bokmål vs nynorsk https://www.ntnu.edu/now/intro/background-norwegian
My understanding is that they are two separate languages, but both are considered (written) Norwegian. In the 1800's, a Norwegian linguist developed Landsmål, later called Nynorsk. Around the same time, another Norwegian developed Riksmål (later called Bokmål). Both are accepted forms of written Norwegian, although Bokmål is much more predominant (and is almost always the form that is taught as a second language).