Boating, even only inland, is such a vast subject that any book entitled The Complete Guide to Boating on Rivers, Lakes and Canals can only be an exaggeration as there is bound to be something it doesn't cover. That said this is a useful guide and i have certainly learnt a useful thing or two from it, despite having hired holiday (cruisers) boats on the Broads and rivers for several years prior to now owning a small cruiser.
The book i am reviewing here is the 2006 edition and all the photos are in colour. However, the book was first published in 1993 and whilst there have been three updated editions since, things have moved on a bit in the boating world and it does seem that the text reads a bit dated if not out of date in places on some specifics. But this is only a minor point as all the basics and essentials are here (if not always clearly explained), whether you're considering buying a narrowboat or cruiser. In addition to the author's sound advice i would recommend the following to those considering buying a boat for the first time:
Hire a holiday boat first to see if boating really is for you before buying your own - whether cruiser or narrow boat.
Do your research, look over as many boats as you can before you buy - visit marinas, boat yards etc., boat owners are generally a good bunch and happy to share their experience, ask questions!
Don't worry about narrow beam or wide beam hulls if you're going to use the boat solely on a river - check the lowest headroom (lowest road or foot bridge, pipe, obstacle) on the river you're going to do most of your boating on and make sure your boat's will pass under it!
Locks - make sure you've got the right key from the right river authority - treat them with respect and never let a member of the general public "assist" you.
Cost - think of a price you are willing to pay for a boat and be prepared to add another thousand! Transportation costs, insurance, moorings, surveys all cost extra.
Get a professional survey before you buy.
Don't panic, chill, relax, enjoy!