In this segment, I shall explain how I will use speech marks.
1. 'Something' - thoughts of a character.
2. "Something" - spoken out aloud by character.
3. [Something] - conveyed by system A.I.
4. {Something} - conveyed using some device.
5. <Something> - conveyed by the Narrator when the story shifts its principal focus, timeline, or location.
Apart from this, capital letters will describe shouting as regular. If I come up with something else, I'll update this page.