Currently I'm developing my website using Django and Heroku.
But I want to upgrade by using React for my front end.
I know react would give me great benefits for front end, I understand the benefits.

I've seen recommendation that using Docker and Kubernetes with Django will be good than using Heroku. I still don't understand why.

I'm new to these things.
Can anyone here please refer to me such links or explanations about "Why should we use Docker and Kubernetes with Django?"
I believe that using Heroku too much will cost high with scale that goes up really fast.

I need some kind of enlightment of Docker and Kubernetes uses with Django.

Where are the points that those things connected.

For example React, React is for front end part. so Django can be full on the back end. Data Integration using Restful API.
React replaced Django templates using components.

How about Docker and Kubernetes with Django, compared to Heroku with Django?

Thanks