Take describes the movement of something away from a location. Emily might say: I have to take the garbage out tonight. Or she might ask her guests: Do you want to take any leftovers home? In these example, the focus is on the fact that Emily or her guests are removing something (the leftovers or the garbage) from her house.
Bring, on the other hand, generally describes the movement of something toward a specified location. According to this convention, you can bring food to a party, but not take food to a party. If Emily is having a potluck, her guests might ask her: Is there anything we can bring? or Can I bring a friend? Emily might tell her guests: Bring something to drink, and of course you can bring a friend. In this scenario, you are moving something (food or a friend) toward Emily’s house.