You can make Web Apps with Python Flask. This means you can make a Web App with only Python as backend programming language.

So where do you get started?
One way to start is by doing a Flask course.

If you prefer learning from articles, there are many Flask articles, that could serve as staring point:

General

• Flask wikipedia
• Flask homepage
• An introduction to Flask

Hello World

• What is Flask
• Flask Tutorial - Hello World
• Flask Getting started
• Flask Tutorial - Routes
• Flask Create an Epic Web App
• Python Flask in Visual Code

Template engine

• Flask Tutorial - Templates
• Flask Template Data
• Flask Jinja2 Template Engine

Database

• Flask SQLite
• Flask MongoDB
• Flask SQLAlchemy

Charts and forms

• Flask JSON and Google Charts API
• Flask Web Forms
• Flask and charts using Chart.js

Deploy & others

• Python to Web
• Flask REST API