Books are for reference as they are written for a particular type of gardening, vegetable, floral, decorative, jungle and can only give a general over view.
Each of our gardens will be unique with its own micro climate, soil conditions and how it was used before falling into our gentle hands, a building site or well tended.
Having seen them all Percy Thrower like my father gardening in jacket and tie, double digging and removing every weed, Geoff Hamilton, a man after my own heart never throwing anything away in case there was a use for it later, and the modern boy wonders, cover it all in decking instant plants and rainbow paints.
They all write books of which I have one or two bought as Christmas presents and they all appear to use passages from older books putting a more modern twist to it, although the falling to bits books are the very old ones I have had years.
People are coming back to real gardening for economic reasons or to taste fresh food as it should be, they need to be guided, any book will have some good tips or information for new comers though they will get much better information from the older generations who have made all the mistakes and learned from them on boards such as this.
My advice is search through the charity shops and find a selection of books, you will often find they have never been opened and the best ones Royal Horticultural Society books giving lots of information go for cherry bobs. Just remember even the best books will only give you guidelines for your own particular patch.