What is the best way to implement Django 3 Modal forms?
No need for separate file for modal-form. Here MVT structure following, whenever forms are used. Easy interaction to template. Moreover if you go through Django documentation, you will get to know easily. 
Submission - mention the form action url. It will call that and check the django forms
I appreciate it if somebody gives the main idea of how to handle submission/retrieval form implementation in Bootstrap modals. I saw many examples on google but it is still ambiguous for me. Why it is required to have a separate Html file for modal-forms template? Where SQL commands will be written? What is the flow in submission/retrieval forms (I mean steps)? What is the best practice to implement these kind of forms? I'm fairly new to Django, please be nice and helpful.