The proper way to make the tag is for Cano to put the glove right in front of the base. Instead, he reaches out toward the runner to make the tag -- a mistake common to little leaguers. Note -- Cano clearly tagged the runner out. But the umpire was obviously confused about what he saw. If Cano had been fundamentally sound in his technique, the play would have evolved as the umpire expected, the fact that the runner was out would have been more obvious, and the play more likely would have been called properly.
Fundamentals matter. Do it the right way. Every time. All the time.
Poor fundamentals may have played a part in blown call on tag at 2B