The AWS command line client allows you to manage your AWS services from your local computer. If you only have one AWS account, then you might be fine with creating a single default configuration. If you happen to run a studio or agency where you manage multiple AWS accounts, you will likely want to learn how to create client profiles.
Single Default Profile
Here's how to set up a default AWS credential.
The command above will create a credentials file within ~/.aws/credentials that looks like this.
You will need your Access Key ID and your Secret access keys.