Hello...

Many colleges offer CSE specialisation in cyber security where you can learn basic about this.

To become an ethical hacker you have to  do many things like:-

• Switch on Linux
• Start to use different OS like kali, Ubuntu,parrot, Linux mint,red hat linux.
• You should know basic of all programming language
• You should try to learn JavaScript, Python,ruby in depth.
• Try to do self study from different online sources.
• You can even join training courses offered by IT companies.

Following are college which offer CSE specialisation in cyber security:-

• Top IITS
• IIITS
• VIT
• SRM
• BITS

Or you can do B.C.A from some good college and start to learn ethical hacking by self-study in parallely.

Refer to this link to know what actually ethical hackers do:-https://it.careers360.com/articles/9402-emerging-careers-ethical-hacking

Hope this helps.
For any further queries feel free to comment.