Add all the ingredients you're using together in a 1 or 2-cup measuring glass (or add straight to a bottle to shake and store).
Whisk by holding the whisk handle between your hands and rotating back-and-forth quickly until the ingredients are completely combined OR by using an immersion blender or regular blender (it's quicker to make it straight in the bottle, but it doesn't mix and stay combined as thoroughly as when whisked).
Notes
Even more variations:
Red Wine Basil Vinaigrette: Add dried or fresh basil and use only red wine vinegar.
French Vinaigrette: Add dried Herbs de Provence and use a white wine vinegar.
Southwest Vinaigrette: Add a little hot sauce to the basic recipe - use over a salad of lettuce, onions, beans, tomatoes, olives and cheese.
Raspberry Vinaigrette: Add a 1/4 cup raspberries, pureed to the basic or balsamic recipes. This works with other berries, too, like blueberries, blackberries, or cranberries.
Creamy Italian Salad Dressing: add two tablespoons of mayonnaise to the basic vinaigrette (one of my favorite easy variations).
*Nutrition was calculated using the basic vinaigrette recipe.