[Python] How backend work with front end using flask

I'm currently on Day 7 of learning Python Flask, and I'm confused about how the frontend connects to the backend.

I have HTML files like register.html and login.html, and I’ve created Flask routes for them, but I’m not sure how to:

1. Send form data (like username and password) from the HTML to Flask.
2. Show success or error messages after submitting the form.
3. Display dynamic content in HTML using variables from Python.
4. Structure my files (templates, static, app.py).

and honestly am just confuse i thought python will be easy for me cos i know to code html and css and js

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