EFS can be attached in the Windows instances?

define Data Lifecycle Manager?

it helps to automate the process of creating snapshot for a volume, creating custom AMI from an instance by defining set of policies. creating policy is free of cost, we can create multiple policies in a region, it applies for specific region instances and volumes

What is red hat and where it is used?

RedHat is one of the company who provides linux kernel based OS for enterprises

What is the difference between SSH and EC2 instance connect?

Major difference is the SSH we need key-pair to connect from a system for example : #ssh -I "instance.pem-key"

Where the EC2 instance connect browser based ssh connection instantly

What are the 3 different methods that you connect to a EC2 instance?

We can connect instance different ways and some of are below
Linux instances
1> SSH from the terminal
2> EC2 instance connect [browser-based ssh]
Windows instances:
3> RDP application