La photo, c'est ton truc?
Does photo here mean photo in English or photography?
I'm sending this to our French expert, Mme.
The difference in French is:
photo = la photo
photograph = la photographie
photography = also la photographie
photographer = la photographe
For #2 & #3, often you can tell by the context, or exactly how the word is used.
Sra (aka Mme)
I'll flag this so I can return later to see if you have any other questions.