Capture
Make sure it's a video I actually want to process, be choosy about what you "ingest", don't just take notes because you like the title of something; be sure the content is solid before committing to full review.
If video - Get video transcribed using tools like https://youtubetranscript.com (free) or Otter.ai - my go to since I can navigate the text and hear the audio at the same time.
Don't directly copy the transcript in, take traditional (literary) notes on the video. Capture the core ideas, and any brief thoughts on the content.
I like to break down the notes into separate core topics headlines as they're presented into the materials.
Digest... Reverse Outlining The Content
Take a break, get some coffee, and come back with your writing hat on. Look at the core sections of the notes you took, what is the "first principle" of the section? The proposition. It should be able to be summarized into one sentence. (example).
Find as many first principles as you can, then go about elaborating on the principle. Keep this to one paragraph, and LINK to the supporting evidence within your original notes. This allows you to keep things short enough to regularly review and internalize.
If you find it difficult to simplify things down to one sentence you may need to do further research into the topic until you can, you should be able to summarize things simply or chances are you don't understand it fully.
You can also link to related first principles as you go, eventually, you'll have a collection of First Insights and a paragraph expanding upon each one, which actively references the source materials.
Correlate...
This step is about connecting your First Principles together to form a "40,000 feet" view of the concept. This is a collection of claims with links to the evidence...
You'll output something like this:
You do actually care about your life, even if your apathy won't let you admit it. So, Don't suffer any more stupidly than you have to FP. Remember: The mind is set (mindset) through conscious action. "Getting your act together" isn't about thinking correctly as much as it's about acting correctly. Life-changing shifts start in the mundane, you can't hope to fix big problems if you can't manage small ones. So, Don't try and fix things you are unqualified to fix. Perhaps most importantly, Be careful what you aim for: "Defining a Genuine Aim Reconfigures The World".
Each sentence links to your first principle you captured, which intern has the detailed paragraph below elaborating on the topic, which in turn has links to your original notes from the source materials.