Best back exercise?

[SpasticatedPengiun]

Hey all!

So I would like to know, what is the best back exercise? I would prefer one where dumbbells or nothing is included as im too poor to go to a gym currently (true) and all I have is dumbbells with a total weight of about 15 kg.
I would also prefer if the exercise did most of my back or all of it if possible (Im pretty dumb when it comes to exercise, so sorry if Im wrong).

PS. I also have a bar (as in the bigger version of a dumbell (it weighs about 5 kg).

[Apollo.]

A wide grip pull up will be the best without any weights, if your bar is heavy enough for you then try bent over rows they are very good for development of your lats. With dumbells although they aren't very heavy you could try one arm rows. If you don't know any of these exercises go on YouTube and you should get some pretty good tutorials