This tutorial teaches developers how to retrieve stock market data from IEX Cloud, format it into HTML tables, and send an email with the Twilio SendGrid API. The script uses Node.js, IEX Cloud's wrapper, and Twilio's SendGrid API to achieve this. It starts by setting up a new project, installing dependencies, and creating a .env file to store API keys. Then, it retrieves stock data from IEX Cloud, formats it into HTML tables, generates an HTML email with the data, and sends it via email using Twilio's SendGrid API. The tutorial also covers common issues, such as sender identity verification, and provides tips for next steps, including setting up a scheduler to run the script automatically every day.