Sublimation is the process of utilizing an outside factor such as sports to satisfy an emotion/impulse for example aggression.
Displacement is the action of transferring a certain impulse to a decoy/replacement object. For example boxing in the gym would be a source of displacement after your boss yells at you in which you can punch the punching bag as a replacement.
Projection is the idea that people project their emotions towards another individual/s
That guy's shirt is so lame. He probably thinks my shirt is lame too.