Hello, I am a complete noob to rooting, I just want to root so that I would be able to use titanium backup, if I root with cf-autoroot il still be able to get updates from Google right? My phone is Nexus 5
I don't think so, if they check for root then no.
If they don't, you could lose root but maybe not, it depends on the update.
Usually people unroot then update then try root again.