Pattern #45 might be easy in C major. Can you play it in Ab major? If you can transpose a pattern to 3 different keys, you own it. Top 5 Patterns You Must Learn First
Buying the book doesn't make you better. Doing the patterns does. Here is a 10-minute daily routine:
If you find a complete PDF version, you will typically find patterns broken down by style. Here is what you can expect: