Are you looking for a book for GarageBand on a Mac or iPad?
GarageBand for Mac has changed dramatically in 2013, when Apple replaced the old iLife version GarageBand '11, version 6.0.5 by GarageBand 10. The current version is GarageBand . 4.12. Books and tutorials describing the older GarageBand '11 will not help much, because important features have been removed or changed, but the tutorials for the more recent GarageBand 10 should help to get you started. Also the built in User Manual, macOS app user guides: GarageBand for MacUser Guide – Apple Support
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I liked Edgar Rothermich's manual very much, because it explained the concepts behind the design, with many helpful graphics, but by now it is also more than ten years old: GarageBand X - How It WorksApplehttps://books.apple.com › book › garageband-x-how-it-...GarageBAnd 10 has not changed much over the years, or the version number would have changed as well.