This tutorial teaches developers how to build a serverless REST API using AWS Lambda and Fauna as the database, utilizing the Serverless Framework for infrastructure as code management. The project starts by creating a new Serverless project with an `aws-nodejs` template, which sets up many pre-written files and functions. Next, it adds dependencies such as `serverless-fauna` and `serverless-dotenv-plugin`. The Fauna resources are then defined in the `serverless.yml` file, including the client secret, domain, and collections. A new server key is created for the database, and an `.env` file is generated to store these credentials. AWS Lambda configuration is added to the `serverless.yml` file, which defines multiple Lambda functions for handling CRUD operations on the Fauna database. The code for each Lambda function is written in JavaScript, using the Faunadb driver to connect to Fauna. Finally, the stack is deployed using the Serverless Framework, and the API becomes live.