There are certain passage names that have special meaning, and let you make your stories look more polished. The most important is Start. It is the first passage displayed when your story is first loaded by a reader.
StoryTitle is where you set your story's title. StorySubtitle lets you enter a brief subheading under the story, and StoryAuthor lets you credit yourself. Note that if you insert macro tags in these passages, they will be re-run every time the player changes passages.
The StoryMenu passage lets you add items to the the menu that hovers in the upper-right corner of the page in the Jonah story format, or on the left side of the page in the Sugarcane story format. You can link directly to passages in your story from this menu. You might, for instance, put an “About the author” link in the menu that links to a passage containing a personal blurb.
Take care with the length of your menu items. A link will be displayed on a single line, even if it means that it will overlap your story's text.
Again, if you put macro tags in this passages, it will be re-run every time the player changes passages. This lets you make a “dynamic menu” that alters itself depending on the player's progress in the story.
The StorySettings passage enables a number of special story options to be set.
This passage is inspired by the “import” feature of various programming languages. It allows you to merge the passages from other .tws or .twee files into your story's HTML file at build time. This lets you work on a Twine project split into multiple files, each being edited independently of the other, but which are built into a single story. It also lets you import a Twine file from a web URL without having to personally download it.
List the file paths and URLs that you want to include, line by line, in the StoryIncludes passage.
If an included file contains a passage with the same name as another included file's passage, an error will be raised when you build.