Looking at photographs is a great way to learn. I have a video about the topic. It is linked at the end of this blog post. I promised a list of links of some of the books I have mentioned in the video.
List of Books you might want to check out
John Szarkowksi: Looking at Photographs
Richard Avedon: Autobiography, In The American West (paperback), In The American West (Hardcover)
Robert Frank: The Americans
Helmut Néwton: A Gun for Hire, Autobiography
Diane Arbus: Revelations, A Biography by Patricia Bosworth
Dorothea Lange: A Life Beyond Limits by Linda Gordon
Daido Moriyama: Remix
Yousuf Karsh: A Biography in Images
These links are Amazon Affiliate links. I get a small commission if you buy something after clicking the link. You do not pay any extra.