Working with QuerySet and managers

Now that you have a fully functional administration site to manage your blog's content, it's time to learn how to retrieve information from the database and interact with it. Django comes with a powerful database abstraction API that lets you create, retrieve, update, and delete objects easily. The Django Object-relational mapper is compatible with MySQL, PostgreSQL, SQLite, and Oracle. Remember that you can define the database of your project in the DATABASES setting of your project's settings.py file. Django can work with multiple databases at a time, and you can program database routers to create custom routing schemes.

Once you have created your data models, Django gives you a free API to interact with them. You can find the data model reference of the official documentation at https://docs.djangoproject.com/en/2.0/ref/models/.