I had a bit of a look at the legitimacy of this topic by looking at the sample pdf.
Straight up the OP also appears to be the Author of the E book and this suggests that this post is
about marketing his publication (E book price about $20). Up to ADM authors to judge if this thread should stay or not.
Case for stay:
Based on the sample, it seems that a fair bit of work that has gone into creating a reasonable beginners guide.
I don't think the price is OTT and so it all appears legit.
Case for delete:
ADM is open source and has a how to wiki for reading up on how to use it.
All this for free, despite the huge effort that has goes into it over a very long time.
In the spirit of available for "free" this "not for free" effort doesn't fit in.
I'd be interested in the opinions of anyone that bought the E book.
Also it would be courteous to provide a copy of the E book to the ADM team.