I've included links to some pertinent articles.
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Learn to serve with lots of spin by accelerating the racket through the ball and grazing it.
(Here's the article Serving Short with Spin. Here's another, Five Steps to a Great Spin Serve.)
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Learn to serve various spins, including backspin, side-backspin, sidespin, side-topspin, and topspin, and be able to serve with sidespin in either direction.
(Here's the article Importance of Serve Variety.)
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Learn to serve low.
(Here's the article Serving Low.)
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Learn to control the depth and direction of the serve.
(Here's the article Depth Control of Serves.)
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Learn to serve with spin using a semi-circular motion so you can create different spins with the same motion by varying where in the motion you contact the ball.
(Here's the article Semi-Circular Motion on Serves.)
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Learn to minimize and do quickly this semi-circular motion so receiver has trouble picking up contact.
(See same article linked in #5.)
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Learn to change the direction of your follow-through with your racket the split second after contact to mislead the receiver.
(Here's the article Exaggerate the Opposite Motion on Serves.)
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Learn to fake spin and serve no-spin by contacting the ball near the handle.
(Here's the article Those Dizzying No-Spin Serves.)
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Learn to serve fast & deep as a variation to your spin serves.
(Here's the article Fifteen Important Deep Serves. Here's another, Turn Opponents into Puppets with Long Serves. Here's How to Ace an Opponent.)
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Learn to follow up your serves.
(Here's the article The Purpose of the Serve.)