How to create custom app (hello world) in Frappe ERPNext

I created a custom app named “hello-world” using the command bench new-app hello-world. The directory structure is as follows:
apps/hello-world
├── README.md
├── hello-world
│ ├── hooks.py
│ ├── hello-world
│ │ └── init.py
│ ├── modules.txt
│ ├── patches.txt
│ ├── public
│ │ ├── css
│ │ └── js
│ ├── templates
│ │ ├── init.py
│ │ ├── includes
│ │ └── pages
│ │ └── init.py
│ └── www
└── pyproject.toml

I am following the instructions from here - Create an App

I want to display a simple “Hello World” message using Python & HTML code on localhost:8000/app/hello-world. I am looking for guidance on how to create this with Python and JavaScript, as well as how to add CSS and JavaScript files without creating a doctype through the UI. Thank you!

Hi,

All I can suggest is to follow the “must to do” tutorial to create app on Frappe made by Hussain (from Frappe Team)

Start page

Real strat of the tutorial if your in a hurry