Should I learn Django or Flask for a backend
I know that both are widely used backend frameworks. So which framework will you recommend me to learn first.
This depends on what you want to do : To quickly summarize the big differences between the 2 frameworks, Flask is much faster to learn, lightweight and allows you to deploy an API in just 2 minutes. You design your project as you see fit. On the other hand, Django takes a lot longer to learn, however the documentation is extensive and very clear. With Django, you must code your project according to an architecture explicitly defined in the Django documentation. Once you have mastered Django it can save you a lot of time ! If you want to make an API quickly, learn Flask first, else if you want to make complex apps that can be understood by all, I recommend you Django
Small Application (Learn Flask) Business Application / Full Featured (Learn Django)
Learn Django. It's the powerful python web framework and the most mature one which includes everything you need along with DRF or django rest framework.