A YC founder I’m in the same WhatsApp group with said "I've seen roughly 10x the volume of high quality senior+ applications after doing this a few times now"
The most insightful book I’ve discovered on writing nonfiction is Ayn Rand’s lectures. She covers all steps of the writing process and outlines everything you need to know to write well.
The second best advice is by PG in Writing, Briefly.
OP here: happy to answer any questions about my setup. Just to clarify - the core idea is not shortcuts but how you can use them to integrate changes in your life like reflecting on how you feel or how well you understand your learning material.
This is by far the most interesting thing about the article, and I'm a little sad to see most of the comments here are about typewriters and keyboard layouts and not about exploring whether shortcuts can change the way you think.