The MongoDB Atlas Free tier offers a forever-free option with promotional code NICRABOY200 for a more powerful cluster. To interact with data through native Go data structures, map MongoDB document fields to fields within these structures using BSON annotations. This approach simplifies working with data and provides benefits such as autocomplete, error handling, and methods specific to the data structure. The tutorial covers creating and interacting with native Go data structures, including converting previous examples to use them with Find and Insert operations, and demonstrates how to create and insert data into MongoDB collections using these new data structures.