Worldbuilding

On designing magic systems
Fake Sci-Fi - extremely common worldbuilding mistake

Characters

On designing heroes
Strawman Chaotic Evil - trope to avoid
The Omniprotagonist Fallacy

Storytelling generals

On Chapter One
Tragedies
Themes of a story

Plot events

Time Skips and why they're dangerous
The Last-Second Rescue trope and how to avoid it
How moral choices in video games could be improved
How to make good moral dilemmas
How to rescue a character without taking their agency

Morals of a story

Sexist tropes