Attachable systems and methods allow a golfer to ‘zero in’ on the desired striking zone or “sweet spot” of a club, including putters and non-putters. One or more guides are positionable relative to the desired striking zone, such that if a golf ball interacts with a guide during a swing, the guide provides aural or tactile feedback that the club has hit the ball outside of the desired striking zone. The device may include at least two guides, one positionable on one side of the desired striking zone and the other positionable on the other side of the desired striking zone. The device may comprise guides in the form of a tab or leaf pivotable from an up position when not in use to a down position for use. If the club head has a back side, a portion of the device may contact with the back side. In particular, if the club is an iron with a rear cavity on the club head, a portion of the device may be received in the cavity to enhance stability, particularly during a swing. Training methods are also disclosed.