Meditation: Shinzen Young is the best available material I know of on Mindfulness. Under articles he has a bunch of short primers examples (PDFs):
He uses a couple concepts that pattern match to woo, but he's very measurable results and clear instructions oriented.
Thanks for sharing! The "Progressive Stages of Mindfulness in Plain English" seems to actually be more about concentration meditation, so I'm glad you shared one of your favorite resources on a different type of meditation.
For each topic, I’ve curated a few links that I’ve found to be pretty high quality.
Full List: https://workflowy.com/s/zUTEaY0ZcJ
I'd like feedback on: