What are Types of cloud storage in AWS

Block Storage
File Storage
Object Storage(s3)

Can we attach EBS to multiple instances?

By default, an EBS volume can only be attached to one instance at a time. However, AWS does provide options for multi-instance access under specific conditions.

How to prevent accidental termination of an EC2 instance

Go to Actions,click Instance Settings,click Change Termination Protection

Select Enable and Save

What happens if you purchase a Reserved Instance for 3 years but decide to terminate the instance after 6 months?

AWS does not allow cancellations or refunds for Reserved Instances. You are still responsible for paying the full reservation period. the reserved pricing remains available for any new instance of the same type in the same region.

Hibernation saves the contents of RAM to the root volume and restores them on restart.

Yes,When the instance is restarted, it restores the RAM contents, allowing the system to resume exactly where it left off.