The best basic bicycle repair book I ever have read was "Glenns's complete bicycle manual" It is very out of date unless there have been revisions over the 30 years since I bought it. It has been superseded by information freely available on many internet sites, updated on an almost daily basis. I would not waste money on any book on bicycle maintenance today
Bicycle repair is about knowing the various requirements of the component suppliers used by various bike companies, which can change from year to year. No book can address that