These are just a few tips and tricks I have picked up along the way. I will be adding to this list periodically, so check back often!
Onions
1 small onion = 1/3 cup = 1 teaspoon onion powder = 1 tablespoon dried onion flakes
Garlic
A head or bulb of garlic usually contains about 10 cloves
1 clove = 1 teaspoon chopped garlic = 1/2 teaspoon minced garlic = 1/8 teaspoon garlic powder = 1/2 teaspoon garlic flakes = 1/4 teaspoon granulated garlic = 1/2 teaspoon garlic juice