Student or Learner
Buy orange, apple, grapes or strawberry.
Does it mean buy either orange or apple or grapes or strawberry?
Does it mean buy orange, apples and either grapes or strawberry?
The sentence mixes singular nouns with one plural, so it's not possible to parse it as is. If all the nouns were plural, it would mean Buy either oranges, or apples, or grapes, or strawberries.
I am not a teacher.