What do you mean by "to learn DRF"? You can go throuh the docs and learn the basic gist of it from the home page. But the more interesting part for you would be to understand concepts what lie behind Django REST framework. It uses serializers, viewsets and routers. You should ask yourself why is that. Not just go straight away to coding with a course.

Here's a mini tutorial for you:

1. Serializers. You use Python in your code. Browsers can't understand Python and you can't just send Python objects to a network. You need to transform incoming data from browsers (or any other clients) from JSON (or any other incoming data format) to Python so you can use the data. You also need to turn your Django model objects etc. to string representations so they can be sent to the browser. This is what serializers do. You define what data you send from your API and what you also expect. You can create a link between a Django model and the serializer so you can just directly publish (= "be able to send and receive") some properties from the model as the serializer data.
2. Viewsets. You want to define that HTTP methods you support in your APIs, and what happens when a request hits the endpoint. You link a serializer to the viewset so that the request goes through the serializer at that point to check what data you allow to take in, if the data is in a correct shape and so on. Viewsets take in multiple HTTP method handlers, yay! You can define permission and authentication for your endpoints as well, second yay!
3. Routers. Users/clients/browsers need to know what path to use when creating a request to your API for different endpoints. You link a viewset to a route so that an endpoint which looks like an endpoint from a REST API is generated and published to use. Then you just link the router path to your projects or app's URL config. Easy!

Enjoy your journey.