What is a Gateway VPC Endpoint?

It allows your resources in a VPC to privately connect to services without using public IPs

Which AWS services support Gateway Endpoints?

S3, DynamoDB

Can you use Gateway Endpoints across regions?

No, they are region specific

What is the maximum number of IAM users per AWS account?

5000

What is IAM policy versioning?

It refers to the ability to maintain multiple versions of managed IAM policy