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
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
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.