The error says UnauthorizedOperation which means you don't have sufficient permission to create the cluster.

Please make sure you have configured your awscli correctly and you have sufficient permissions.

Required permissions are documented at https://github.com/weaveworks/eksctl/blob/master/userdocs/src/usage/minimum-iam-policies.md

Be sure to use the 12-digit Account Id from Account Settings when replacing the placeholders.

This is how you change the permissions of an aws user https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_change-permissions.html

I am also a newbie to EKS. The problem of this matter is you have not permissions to do something. First, we should know what permissions we need, however, as a newbie we don't wanna know so much. So as Kushagra Saxena said, we set our IAM account as Admin for learning.

Use Existing Policy

1. Select Users

2. Add permissions

3. Select AdministratorAccess and then Next Next Next!

Or Use Custom Policy

If you wanna use custom policy, like this:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "*",
            "Resource": "*"
        }
    ]
}

You should create your own policy.You can do as following:

1. Select "Policies" and "Create Policy"

2. Replace by your Json and Next Next.

3.Select your user and add permissions as "Use Existing Policy" do。

I ran into this problem recently and was at a loss because I could successfully run
$ aws ec2 describe-availability-zones

The problem turned out to be a MFA requirement in IAM. Luckily an AWS support person assisted by pointing me to the AWS IAM Policy Simulator https://policysim.aws.amazon.com/home/index.jsp

By selecting my user, EC2, and describe-availability-zones, the simulator showed the reason for the failure.