"Me" is an object pronoun, meaning it is used as the object of a verb or preposition.
"I" is the subject pronoun, used to indicate the person performing the action.
Here's a simple example:
* Correct: *I* went to the store. ("I" is the subject performing the action of "went")
* Incorrect: *Me* went to the store.
Let me know if you'd like more examples or explanations!