A little doubt about learning java for a month

     I have been learning java for a month, and I have learned the basics. I used to be a more playful person. I used to play games in addition

to . After learning java, I insisted on writing code every day. I felt pretty good at first, because I could basically complete the daily

exercises , but when I used classes, inheritance, and interfaces, I couldn't understand it.

There are two questions that I don't understand

     all the time. 1. Class person{} doesn't this class contain all the people, why should I use a specific class to inherit it,

isn't it the same with direct instantiation?

     2. Interface, the interface is all abstract methods, and the implementation has to be implemented in a concrete class. Does the interface feel a bit

redundant ?