FastAPI is a high-performance web framework for Python, known for its speed, intuitiveness, and support for API standards such as OpenAPI, bolstered by the use of Pydantic and type hinting. While it's easy to quickly set up simple APIs with FastAPI, developing more complex applications requires practice, which is facilitated through a structured learning path comprising 10 exercises. These exercises guide learners from the basics of creating a "Hello World" API to implementing a full CRUD (Create-Read-Update-Delete) API for tracking food and calorie intake, complete with Pydantic models, exception handling, and authentication using JWT (JSON Web Tokens). The course also touches on returning HTML responses and securing the API with OAuth2 and JWT tokens, aiming to enhance learners' proficiency in building reliable APIs. The learning path is freely available on the codechalleng.es platform, encouraging participants to share their completed projects and engage with the community on Slack.