How can you tell if it's a Simile?
Simile compares stuff things using "Like" or "As"
Example: Brave as a Lion.
This sentence uses "as" in the sentence. Therefore it's a Simile.
How can you tell if it's a Metaphor?
Metaphor is like Simile but the only different thing they have is Metaphor's DOES NOT uses "Like" or "As"
Example: The Snow is a white Blanket.
This sentence does not use "Like" or "As". Therefore it is a Metaphor.