As Tiger stated you tell the Blurtit community and we'll give you feedback, comments and links, for a better understanding.
What are dispersion, interference, diffraction and polarization. Please explain with examples?
Consider this a project that you have to prepare in order to present it to a small group of people.
The research you have to do in order to understand these relatively simple and limited specific properties of light in order to explain in theory and present clear examples will make it much easier for you to retain the imformation for future purposes.