How to use data obtained from a form in Django form?
Start by writing it in a way that the user submits the form (like any normal django form), you process it in your view, do the calculation, and return the same page with the calculated values (render the template). That way you know everything is working as expected, using just Django/python.
Then once that works, refactor to make your form submit the data using AJAX and your view to just return the calculation results in JSON. Your AJAX success handler can then insert the results in the current page.
The reason I suggest you do this in 2 steps is that you're a beginner with javascript, so if you directly try to build this with AJAX, and you're not getting the results you expect, it's difficult to understand where things go wrong.
I'm trying to create a form in Django using Django form. 
I need two types of forms.

A form that collect data from user, do some calculations and show the results to user without saving the data to database. I want to show the result to user once he/she press button (calculate) next to it not in different page. 
A form that collect data from user, look for it in a column in google sheet, and if it's unique, add it to the column otherwise inform the user a warning that the data is not unique.

Thanks