Q: there not enough room on here for my question.

OS X Yosemite: I had updated my Mac for iTunes thinking this was a good thing but when I did it screwed it up I listed to book and some of them are series but I was unable to get to them because of that I don't ever what it on my computer ever but it's back in the update. I will like to know will it automatically update without me doing it. And can I update one and the not other and how can I delete the other after I update the other.