This is so basic but it is the beginning of nearly every salad.
The exciting part comes when you make it your own...

Try different kinds of vinegar... tarragon, seasoned rice, balsamic, sherry, champagne, red wine, etc.
Try adding some chopped shallots, thinly sliced scallions or a bit of minced garlic.
And how about a dab of mustard?
Don't forget the fresh herbs!
And if you wish, add a bit of cheese. (I like blue cheese, parmesan or feta)

2 Tbsp. VINEGAR
5 Tbsp. EXTRA-VIRGIN OLIVE OIL
KOSHER SALT
FRESHLY GROUND BLACK PEPPER
Optional: shallots, scallions or garlic, mustard, herbs, cheese

In a small bowl, whisk together the vinegar and olive oil until well combined.
Add your favorite embellishments.
Season to taste with salt and pepper and whisk again.

Be sure that your salad greens are cold, crisp and dry and toss with some of the dressing.