Just discovered this Reddit lol

I just discovered this Reddit. I just bought my PS5 about a week or two ago, just finished the story. I’m about to complete all the side missions, etc. but I see a lot of this Reddit filled with ppl using photo mode. Is it fun getting random photos, and where do they get stored to? Kinda curious on why yall do it, and what yall recommend if were to try and pick it up