The aspect of Continuous Delivery in DevOps handles continuous release to production. As this aspect automatically deploys your code changes to testing or a production environment that could then be deployed just by a single human intervention. You could set up the Continuous Delivery based on your requirements, based on the needs of the company, the business requirements, and other factors.
If you wish to get certified in DevOps, I recommend you try DevOps training course from Intellipaat. And if you are a novice, watch the following video on DevOps Lifecycle to get started.