My Grandparents Deeded Their House To Me?

Hello, I am a 20 year old college student who just learned that my grandparents deeded their house that they live in currently to me, so it is apparently in my name. What comes with this? The mortgage is payed off, there is just property tax now. I know literally almost nothing about owning a house, I didn't even think I would be able to in my life. My grandparents are living in it until they pass of course, but the house and property is now mine? Which I am in shock about, honestly. Do I need to do anything legally any time soon? I don't know how this process works at all.