The former world number 7, Eriko Hirose, recently released a badminton book which seems to cover basics and more for beginner + advanced players ("everyone"). A preview of her book is available on the Japanese version of a popular American e-commerce website when typing her name in Japanese 廣瀬 栄理子. The book is only available in Japan for now but it seems it also includes some drills and exercices. May be some Japanese badminton shop will soon propose it to their international customers. I wouldn't count on the book being translated in another language though. A good initiative worth some attention, badminton books are quite a rare sight.
