Hey Appu,
Andaman is truly one of the best holiday destinations in India. If you are planning a trip to visit the islands, I recommend you to go through this guide on Tripoto: https://www.tripoto.com/travel-guide/andaman-and-nicobar Other than that, the best way to gather useful information about a destination is to know about other travellers' genuine experiences there. You should go through the thousands of stories and guides on Andaman travel shared by members of the Tripoto Community. Attaching a few of the informative ones below! Have a great trip :)