Facebook account hacked

Hi
I am anlonder facebook user that hasn't gotten on facebook in the past two years but it is still there but someone changed all of my information sign on phone. Security questions etc. Any help you can give me that's kind of simple will really help. My daughter is twenty and I am missing a lot.
Thank you so much for your help. I have tried and do t understand why people would try to take my page from me I am old