Rural diners used to post signs promising "Sudden Service." Some probably still do. This book is intended to offer much the same thing: quick access to help you get an immediate job done using Lightroom.
Lightroom 101 is intended as a guide for beginners. You can read it end to end as handy guide to getting started with Lightroom. Use it to get founded in the basics. Leave the more esoteric functions-and there are a lot of them-for a time when you're more experienced and confident.
Later, you'll often find the book more useful as a handy reference to help you get the most from Lightroom. In fact, you can carry this book in electronic form, right on an iPad or iPhone.
Check the Contents for the job you need to do; then, you can jump directly to that section. Cross-references lead you to other helpful information. By taking the first steps here, you can enjoy growing mastery of this powerful program.