The Jecht Shot is one of the best shooting techniques for Blitzball, although you have to learn it outside of Blitzball. While on the S.S. Winno, on the way to Luca, you will have an opportunity to learn the Jecht Shot by interacting with the ball on the deck. You will need to press the corresponding direction on the directional pad, in conjunction with the X/A/B button, whenever the sentences appear on your screen. If you hit enough of them, you will learn the Jecht Shot. Note that if you miss it during the main story, you can reboard the boat in Kilika to try again.