• Is user input a choice? Can I ask a user to “enter a name” for example
• Can the same choice be shown more than once (as long as it’s the same choice). e.g. could every passage have a “continue or quit” choice — I’m assuming no
• Can a single choice be shown in the UI outside of a passage, if it’s always there and no other choice appears. e.g. could the entire game have one lingering “tell them what they want to know” link that was always there?

Aight some answers! 

* Name input in a textbox is fine on its own (like a starting point, for flavour), but if it alters the story itself (i.e. branching or variation in text), then it would be considered as a choice. Or if you are going the Parser-in-a-Twine way, then follow the parser rules.

* If the 'quit' part of the *Continue or Quit* actually ends the game (like a game over/return to menu end, or a *Restart the game* way), it's fine. Otherwise, it's a choice.

* If this is some meta-/non-story-choice (Codex/Settings/Restart), fine. If it actually affects the story, it should follow the one-link-only/multi-choice rule.

Hope this helps!