I purchased this book to revamp our company website. After taking a one-month course at an academy, I am now studying on my own using the videos in this book, and I found them to be very informative. Author Lee Hwa-young's engaging teaching style has been very helpful. The only downside is that you need a DVD-ROM drive to play the videos! However, most modern computers are equipped with a DVD-ROM drive (though mine didn't have one ^^;), so I encode the videos onto a drive, save them to an MP4