Photos..how do I "scroll" through them

On my PC, I simply opened them up, they would open in Windows Picture viewer, and you could use the arrow buttons to scroll through all the pictures.


I open a picture on my Macbook, and it opens one picture. Then, I have to close it and open another one individually. Is there an easier way to do this? I am NOT using iPhoto, because I can't figure it out.
Unless someone can explain to me how to use it. 😀