This is a DVD by professional golfer Koji Koga. I think it will be very helpful for beginners to advanced players. Each disc contains 1 to 2 hours of content and is explained carefully, so you can improve even if you study on your own. The short game DVDs are a 2-disc set, with a basic and an advanced version. There's also a 2-disc set for error correction. (See photos 2 and 3) The physical training DVD is perfect for those who are serious about golf. I also had lessons from Koga-pro, and I bought these DVDs for about 2,000 yen each at that time. Koga-pro: As a TaylorMade contracted teaching pro, he has given lessons to about 150,000 people. Koga-pro's golf lessons have a good reputation. His easy-to-understand improvement program is highly praised by Keita Uemura, Masaki Tani, and Yoshinori Kobayashi! In fact, Koga-pro's lessons have produced many club champions. Thank you for your consideration.