1- find ami id using aws cli ( use bash,  use aws  credentials and then use the long command )

2- or browse the various website

bash

aws ec2 describe-images \
    --owners 'aws-marketplace' \
    --filters 'Name=product-code,Values=aw0evgkw8e5c1q413zgy5pjce' \
    --query 'sort_by(Images, &CreationDate)[-1].[ImageId]' \
    --output 'text' \
	--region us-west-2

Market Place for AMI:  https://aws.amazon.com/marketplace/

paravirtual (PV) or hardware virtual machine (HVM).

The main differences between PV and HVM AMIs are the way in which they boot and whether they can take advantage of special hardware extensions (CPU, network, and storage) for better performance.

For the best performance:  current generation instance types and HVM AMIs

EBS:  Elastic Block Store          provides raw block-level storage that can be attached to Amazon EC2 instances.

solid-state drives (SSDs)   Vs    HDD

Amazon EC2 Instance Types

https://aws.amazon.com/ec2/instance-types/

Centos AWS ami:    https://wiki.centos.org/Cloud/AWS

Click on the link "CentOS-7 X86_64

used by Contrail 5.0 ( ami-337be65c/eu-central-1  or  ami-a042f4d8/us-west-2 )

Click on "Continue and Subscribe" to find the ami-id

Ubuntu Locator of ami :  https://cloud-images.ubuntu.com/locator/ec2/

Ubuntu 18 TLS:  ami-9baf43fc  in EU-WEST-2

ami-d27709aa    US-WEST-2

ami-05f39e7b7f153bc6a    us-east-2