free ebook on Sub2

the resource is not mine, I just had a chance to read the ebook.

Thanks for the link. I am reading it now, seems like it is a decent primer so far. Shockingly I haven’t seen any upsell to a paid program yet, I always expect that in free courses. I’ll post back when I am done reading to let anyone else interested in it know if there is any meat to this or if its all fluff.