How to make an enemy to deviate from shots?

I want to make an IA of my game . I need a way to get the shots (prefabs) in the game to compare with the enemy , and the enemy to deviate . I've already tryed to put the prefabs in the variables on script but it didn't work. I want to get the shots and compare with the enemy position . How can I do it? Please I'm beginner on unity.