To prepare the avocados–remove the pits and dice in the skin. Use a spoon to scoop the avocado from the skin. Place in a large bowl. Add the onion, garlic, jalapeno, corn, and cherry tomatoes. Stir to combine. Add the cumin, 1/2 teaspoon salt, and cilantro (if using–I usually leave it out because my husband doesn’t really like it) and lime juice. Stir to combine. Taste and add remaining salt if needed.