Photography Genres and Classifications

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