Trickykid, glad to see you back here. Not sure if you recollect, but over a year ago when I was thinking about switching to Linux and joined/posted here, you were almost one of the first posters to encourage me to give Linux a shot. Now, I am glad I decided to try Linux.
Agreed that these books must be a community effort. If everyone gives feedbacks and shares correct info. with the Authors then this will be good for all concerned.
Yes, Linux is efforts are free/voluntary done by people in their spare time. So, in the future I need to be consider this also. Thank you for pointing this.