AWS CodeStar is an AWS service that offers the tools that you will need in developing, building, and deploying applications on AWS quickly. Now, once you start an AWS CodeStar project, it gets unified with the project dashboard, and integrated with a 3rd party tool, JIRA, to track issue and manage the project.
If you wish to know more about AWS and want to get trained and certified, check out the AWS DevOps course, from Intellipaat. Also, watch the following video on AWS DevOps Services to get a better understanding.