Strike the ball while it is forward of the body

keep your elbow close to the body

Do not strike the ball too early – allow the ball to come to the bat and follow through on the intended flight path. The trajectory of the bat can be thought of as hip to lip

Keep the bat above the elbow while striking the ball – otherwise over-hitting may occur.

Use the elbow and a longer swing to impart topspin.

Use the body for power – legs and torso rotation add to the power.

Tom Lodziak explains it well in this video: