GitHub has introduced a new feature called nested task lists to enhance task organization by allowing users to break down tasks into more manageable steps. This update is particularly useful for complex projects that require multiple stages, such as figuring out wormholes or building prototypes, by providing a clear visual representation of task progression. Users can interact with these lists by checking items on and off to reflect their completion status, maintaining the functionality of previous task management features. For further assistance, users can refer to the Writing on GitHub article in the GitHub Help section, as announced by Matt Todd.