Where is it? Find the tutorial here: https://codecapsules.io/docs/developing-a-persistent-sleep-tracker-part-1-handling-users-with-flask-login/

What is it? It is part one in a two part tutorial series focusing on building a sleep tracker which visualizes the user input by leveraging Plotly graphs. It will also take you through creating a login system with flask as well as using MongoDB to ensure data persistence.

What you need to follow? This tutorial is best suited for those with some Python, HTML, and Flask experience. But even if you feel you don't have much experience with these, don't worry. The tutorial walks you through this application step-by-step.