In which direction to look for information about creating a small window on flask?

Question

Flask

It is necessary to develop an additional window for editing information that appears on top of the main window. Let's say a couple of text fields and OK and Cancel buttons. When you click on the OK button, the information in the database should be updated. Tell me, in which direction to look for information on creating such a window?

pop-up, modal, dialog, additional, popup, or iframe in general?

And what in this case to look at js?

Answer 1

https://itchief.ru/lessons/html-and-css/how-to-cre...
look towards the front, yes