I learnt both React and Django. Should use them togather?

Hi awesome programmers out there,
I two months ago learnt a lot of the basics of Django framework.
I started to learn React recently
The question is : I can see that I can use React alone to build my entire website without the need of a backend framework. Do I really need Django or any backend framework in my website if I can do everything like form validation,fetching data and routing from React alone ?
I hope my question is right and you can get what I mean
Thank you all in advance

I would say, start building. Only then you will figure out if your conception is valid or not.
Adjust your vision and learn what you think you need to complete the project.