Learn QGIS: Your step-by-step guide to the fundamental of QGIS 3.4, 4th Edition

As far as I could tell, "Learning QGIS" was written quickly, with very poor editing. I found it riddled with inaccurate descriptions and omissions, and most particularly, it's very poorly indexed, so answers aren't easily found. The first round of QGIS sample data can be downloaded easily, but the promised "extra material," was not available at the publisher's web page (which turned out to be nothing more than a promotional list of additional books). This left unanswered the question, why force more than one download in the first place? The author also takes liberties with oddly misplaced or non-standard terminology that is unexplained, and leads to unnecessary frustration. Finally, the book is obsolete. It is written for version 3.4, but QGIS is already up to version 3.16. The poorly printed B&W illustrations are bad enough, but changes in the software through version 3.16 make some of the book's instructions impossible to follow. Unfortunately, the appalling price of most instructional books about QGIS leaves few options available. All I can offer is, choose wisely.