Django REST Framework (source code), typically abbreviated "DRF", is a Python library for building web application programming interfaces (APIs).
How to Developer APIs with Django REST Framework covers the steps for creating a development environment for your Django+DRF project then creating API endpoints with the test-driven development (TDD) approach.
The official DRF tutorial is one of the best first-party pieces of documentation on any open source project. The rest of the DRF docs are spectacular as well.
Django: Building REST APIs is the first part in an excellent multi-part series on DRF:
How to optimize your Django REST Viewsets
provides a good step-by-step example about using select_related and
prefetch_related in the Django ORM layer to avoid
large numbers of unnecessary queries in your views. Also, props to the
author for wearing a UVA t-shirt in his picture when his blog says he
works as a developer in Blacksburg, Virginia (where Virginia Tech is
located).
How to Save Extra Data to a Django REST Framework Serializer is a concise, handy tutorial for combining additional data with the already-defined DRF serializer fields before saving everything to a database or similar action.
Django polls api using Django REST Framework gives a great walkthrough for creating a question polling application backend with code and the explanation as you build it.
Django REST Framework Permissions in Depth has code examples and explains permission classes versus authentication classes in DRF.
TLT: Serializing Authenticated User Data With Django REST Framework
Building an API with Django REST Framework and Class-Based Views