This is a wonderful tool in any Actors workbox. I only wish I'd had something like this when I started in the profession several decades ago. It's full of excellent advice on all areas of the profession and is a 'must have' for anyone starting out and also gives great tips and reminders for those of us who've been in it a while. I even learned stuff I had no idea about and was particularly interested in the sections about what to look for in Head Shots and the Voice Over section.
This is an excellent book/guide. Do yourself a favour and buy a copy. (No, I don't get any commission from sales, I just want you to help yourself)