I have been super busy lately, but I have managed to complete a book I was working on ? about the kechari mudra. I titled it "Kechari Mudra ? A Culmination"
I mention a lot of introductory topics that people here will be well aware of, but I also included a few ideas that I haven't heard elsewhere.
I will leave a link to the book below ? this is version 0.914 of the book ? but I want to improve it in the future.