What to read on the topic of creating server software?

Question

Software design

Good afternoon,
I am writing my own small project, but before that I had no experience in writing server applications. Right now everything is clumsy in Django and all the work (sending the request, processing the response, working with the database) happens in one session when I load the web page.
I am interested in how the server software architecture is generally built, how the interaction between frontend and backend takes place, how tasks are systematized, how best to organize the work of the database.
Thanks in advance.

Answer 1

https://docs.djangoproject.com/en/2.2/howto/custom...
https://docs.celeryproject.org/en/latest/django/fi...