To oppose means to disagree or go against something. It's like when two teams are playing against each other in a game - they oppose each other's strategies and goals.
To differ means to have a disagreement or be unlike something else. It's similar to how people may differ in their preferences for different types of music.
Conflict occurs when there is a clash or disagreement between two opposing ideas or interests. Just like how superheroes often face conflicts with villains who have opposing goals.