A 'story swerve' can be another name for a twist on a story. Think of it as the moment when the story veers off in a different direction than what the audience was expecting. It can be a change in a character's motivation, like a hero suddenly being revealed to have a hidden agenda, or an unexpected event like a natural disaster hitting the setting of the story out of nowhere. This sudden shift makes the story more interesting and unpredictable.
One example could be 'plot deviation'. This means the plot goes in a different way than it seemed to be going. For instance, in a romantic story, when the two characters who seem to be falling in love suddenly find out they are related.
Well, 'the commencement' is another way to refer to the start of a story. It's like the story is about to commence, start its journey, and draw the reader in from that very first moment.
The start of a story can also be called the 'opening'. For example, in many novels, the opening sets the scene, introduces the main characters or gives a hint about the main conflict.