Making money with my photos?

Is this really true? I mean, I know the artists sell their arts and everything, the photographers sell their beautiful capture but I didn't know I can sell my photos!!! Although it might be precious to me but it's definitely pure garbage to others don't you think?

https://digitalglobal.com/community/threads/making-money-with-your-photos.149/

yeah just try it man. when will u know. Just make it royalty free. I read royalty free can boost yer income

Well what kind of photos you take ? Nature, people, city ?