Final answer:
To correct the sentence, you should insert two commas to separate the items in the list.
Step-by-step explanation:
To correct the text, you should insert two commas. The revised sentence would be: "Salads can be made with lettuce, spinach, or other types of greens." Commas are used to separate items in a list, and in this case, the list includes lettuce, spinach, and other types of greens. By adding commas, the sentence becomes clearer and easier to understand. For example, if a person wants to make a salad, they can choose to use lettuce, spinach, or other types of greens.