In the third installment of a series on Python type hints, the article explores more advanced examples to enhance understanding of type annotations, focusing on meaningful empty variables, class and instance variable annotations, and the use of type aliases to improve code readability. By illustrating how to annotate variables outside function definitions, the article emphasizes the clarity type hints bring, especially in revealing the structure and purpose of data, such as dictionaries or class attributes. It also discusses the use of typing.Union and typing.Optional to handle multiple types and None values, respectively, highlighting how these practices help prevent runtime errors and improve code reliability. The introduction of Python 3.10's TypeAlias is presented as a more explicit way to declare type aliases, further enhancing static type checking and code comprehension. The article concludes by inviting readers to engage with the author for further discussions on type hints and related topics.