Hey Raj Chhetri,

Computer Science is the study of the theory, experimentation, and engineering that form the basis for the design and use of computers. It is the scientific and practical approach and its applications and the systematic study of the feasibility, structure, expression, and mechanization of the methodical that underlie the acquisition, representation, processing, storage, communication of, and access to An alternate, more succinct definition of computer science is the study of automating algorithmic processes that scale. specializes in the theory of computation and the design of computational systems

All the best!

Yes, it will be good if you go for CSE branch if you are interested in Ethical hacking. CSE is the best branch for it and also have good scope in the future.

You can also pursue some courses such as JAVA, Advanced JAVA, C++, etc. to be a good programmer and hacker in future.

Good Luck!!