Yoga books
There are hundreds of yoga books available, and together they cover anything that you would ever need to know about the subject. Whether you are a beginner or are quite advanced, you can find books to help you safely get to the next level of your workout. Bookstores almost always carry something on yoga, and you can find many more in yoga shops and studios.
Beginner yoga books are the most popular types. They give an overview of what yoga is and how it is supposed to help your body. They also cover what you need in order to practice properly such as clothing, mats, and other things.
If you are interested in yoga, you may want to look into taking classes. This way you know that you are doing the motions properly. But yoga books will help you to keep practicing and improving between your classes.