We know that books is always give you right knowledge as well as it is your best friend, and it is depend on your thinking, how you can adopt it.
Basically Emotional and romantic stories is like by many peoples, Because it is related almost our real life stories and anyone people can’t ignore this stories.
And Adventure stories is also a very popular for many peoples like - Harry potter, superman etc.
Basically many peoples spend our time with in books because they feel very comfortable with them and take it seriously .
So I Suggest, you will read any books by your interest.