wtf is oauth2.0?

This repository is starter code for a Udacity course on authentication and authorization. It provides a simple web application, a restaurant menu manager, that lets you browse, add, edit, and delete restaurants and their menu items. The app is built with Python using a lightweight web framework called Flask, and it runs on your local machine inside a pre-configured virtual environment. The project uses a tool called Vagrant along with VirtualBox to create a self-contained Linux system that runs on top of your regular computer. This means you don't have to worry about installing Python, Flask, or other dependencies directly, the virtual machine handles all of that. You can share files easily between your computer and the virtual environment, so editing code on your machine is reflected inside the VM. Once everything is running, you visit a local web address in your browser to interact with the restaurant app. This is designed for students learning how to build secure login systems into web applications. A concrete example: imagine you are building a small app where restaurant owners log in to manage their own menus, and you want to let them sign in using their Google or Facebook accounts instead of creating new passwords. That scenario is what this course project prepares you for. The restaurant app gives students a working foundation they can extend with OAuth 2.0-based login features. One thing worth noting is the reliance on Vagrant and VirtualBox for environment management. This approach was common in course materials because it guarantees every student has the exact same setup regardless of operating system. However, Vagrant-based workflows have become less prevalent in recent years, and some of the tool versions referenced in the instructions may feel dated. The README doesn't go into detail about the actual OAuth implementation itself, the focus here is on getting the base application running so course lessons can build on top of it.