If the photographer is interested in the people in front of his lens, and if he is compassionate, it's already a lot. The instrument is not the camera but the photographer.
What you need to be a good photographer is an overwhelming curiosity and a good digestion.
You can't make a great musician or a great photographer if the magic isn't there.
I came to photography by accident.
Lesson number one: Pay attention to the intrusion of the camera.
What drove me and kept me going over the decades? If I had to use a single word, it would be 'curiosity.