I didn't look at the portrait one as 'a professional' but from the point of view of someone who needed help, and it is worse than poor. (incorrect focal length guidance - useless lighting guidance and nothing in it at all about 'people')
In the interests of research I clicked on the 'insects' one; as I know nothing about that, so easier to get into 'newbie' mode.
The good news is that it's some use, with actual useful info about focal lengths, but very Canon centric, and there's useful info about insects too, and a little about lighting (not specific enough to be useful)
However, the omissions are a bit annoying; it doesn't mention bellows, lens extenders, close up filters or lens reverse mounts - and it being Canon centric, really should have mentioned the MPE 65