Dear Rajnish

Basically core branch means which we are going to learn in depth of that branch like in Mechanical we're learning about machines, in Cs learning about computers, coding etcc.,

These are the best engineering branches:

Computer Science & Engineering/IT

Electronics & Communication Engineering

Electrical Engineering

Mechanical Engineering

Civil Engineering

Environment Engineering

Chemical Engineering

Biotechnology

Genetic Engineering

Aeronautical Engineering

Take wise decision, while choosing.

All the best