Summarize this article:

Wind direction is highly important when learning backspin shots. Hitting into the wind will often result in increased spin. However, this may be back-spin, which is desired, or it may be side-spin, which can cause your ball to travel off course. The higher your ball goes, the more time it has to travel sideways.  Aim to hit shots with lots of backspin when there isn’t much head-wind. You may find that you are never able to consistently backspin without a favorable wind. Many professionals avoid attempting to hit shots with higher-than-average backspin when the wind is against them. Friction is essential to creating backspin, so it’s more difficult to create backspin on short shots (like those at 50 yards (46 m)). It’s easier to create friction between the ball and the club-face when the club-head is travelling at higher speeds, such as those used when hitting shots at longer distances (such as 160 yards (150 m). You may want to start with mid- to long-range shots while learning backspin. The "face" of your ball is the circle you see when viewing the ball head-on. Hitting your ball lower on its back face will create even greater force in your backspin, improving it.  This characteristic is called the "vertical gear effect." It states that balls hit lower on the face will have greater spin than those that are hit high.  If you hit a shot high on the club-face, grass may be caught between the ball and club-face, as the club-head travels toward the ball, into, and through the ground lower.

Summary:
Backspin into the wind. Backspin long shots for better results. Strike low on the face of the ball.