I have a “world bible” that I created on onenote with all of my characters, locations, lore, etc. As part of that I have my stories plotted out in rough notes, then chapter by chapter in a table, (this often changes when actually writing but it’s a great foundation).
Lots of people use Obsidian or Notion to do the same thing. I already had onenote on all my devices, so it was easy just to add notes to my notes section if an idea came to me on the move that I could return to later.
I’ve tried to move to obsidian or notion a couple of times, but I think I have a certain efficiency now with my crude system, and it just seems to work for me.
Let’s be real, If any AI was going to turn into skynet, it would be an AI trained on twitter data.