The classification of photography into genres is incredibly difficult as there is so much cross over.
Different organisations, institutes and galleries classify photography in different ways.
Most types of photography roughly categorising into three different areas:
People / Places / Things
People
Portraits / Documentary / Street / Photojournalism / Sports / Fashion / Travel / Pets / Animals / Commercial / Advertising
Places
Landscape / Seascape / Cityscape / Underwater / Astrophotography / Night Sky / Aerial Photography
Things / Objects
Still life / Architecture / Flowers / Macro / Micro/ Food / Products / Vernacular / Abstract