This tutorial demonstrates building a FastAPI application to manage posts. It covers retrieving a single post using a path parameter (`/posts/{id}`). The path parameter, initially a string, is validated and converted to an integer using FastAPI's type hinting, preventing errors from invalid input. A `find_post` function retrieves the post from a list (later to be replaced with database interaction). Error handling is improved by leveraging FastAPI's built-in validation, providing user-friendly error messages.