A PDf book that could be updated as new information becomes known, to include PCB problems, part creation problems, autorouting problems , and others, with detailed instructions on how to deal with each, would be very useful.  Make the PDF book searchable and it could be a valuable resource. Many of the answers I get don't go into enough detail. For instance, when creating a part, they show how to setup snap, and adjust snap to get parts laid out, but they never consider that there spacing on parts varies, where some spacing might be 2mm, but other spacing on the same part can be 2.5mm, and other sizes.  I don't do a lot of projects, so what i learn, sometimes gets forgotten by the next time I need it.