There are two ways to use a cocktail shaker: the shaken method and the stir method.
The shaken method is used for cocktails that contain fresh ingredients, such as juices or fruits. To use this method, fill the larger part of the shaker with ice and add all of your ingredients. Place the smaller part of the shaker on top and seal it tightly. Shake vigorously for about 30 seconds. This will help to mix all of the ingredients together and create a smooth, evenly mixed drink.
The stir method is used for cocktails that contain only liquor, such as martinis or Manhattans. To use this method, fill the larger part of the shaker with ice and add all of your ingredients. Place the smaller part of the shaker on top and seal it tightly. Stir gently with a long spoon for about 30 seconds. This will help to mix all of the ingredients together without over-diluting them with too much ice.