From the publisher's website:

The large twill family with its signature diagonal lines contains a surprising variety of patterns and textures. We look at simple four-shaft point twills treadled two shafts up and two shafts down. With four treadles tied up and a shuttle of colorful weft, you're ready to explore a fascinating group of easy twills in five colorful fiesta towels.

Also included:
How to thread heddles
Smiling selvedges and loose edge threads
Skipped selvedge threads and floating selvedges