Adobe Photoshop Lightroom Classic Classroom in a Book (2020 release)

Concepción, R. C. (2020). Adobe Photoshop Lightroom Classic: 2020 release. Adobe Press. 

Contains 12 lessons that cover the basics and beyond, providing countless tips and techniques to help you become more productive with the program. You can follow the book from start to finish or choose only those lessons that interest you.