An example of how light behaves like a wave is how it interferes constructively and destructively with other light waves. Think of the popular slit experiment. A way light acts like a particle is how it travels in little packets of energy called quanta, like little balls of energy.
Try <a href=http://www.colorado.edu/physics/2000/polarization/polarizationI.html>this</a> for some help in understanding polarization.