Nexus 7 Asus tablet stuck on Google booting up page

[AC Question]

So I'm not much of a good computer/phone person and I'm completely new to Android. I got this tablet from my aunt during around May. It worked fine with only few problems but today something happened. Yesterday when I was going to sleep I charged it like I do everyday. I leave the tablet on too. Then today when I woke up to see it, its on thee Google bootup. I thought maybe my little sister tried to turn it on so I turned it off and turned it on again. Still stuck on it. I know there's already threads of this problem but I wanted to make a new one because I didn't really understand them. I hope someone can answer soon because I need my tablet for school and music .