Glad to help! I’m somebody who wishes more videos were blog posts so I totally get it. I tend to enjoy Matt Colville’s videos, though.
There’s a short summary at shop.mcdmproductions.com/…/the-talent, with a few excerpts from the PDF (in images, unfortunately), but I felt like in this case the video covered it better.
And yeah, I feel like strain could be so much fun to roleplay, compared to spell slots.