Learn to create a data model for a to-do list app using JSON and Codable datatypes for local storage in this first part of a five-part series. Explore the process of setting up a project, designing the data model structure, and implementing a data manager. Discover techniques for accessing the document directory, loading and decoding array model objects, and managing file operations. Gain practical insights into building the foundation for a fully functional to-do app with local data persistence.