Okay basic astrology time! If you're interested in this topic, the key is not to complicate the descriptions too much, they tends to be general overall. Keep in mind that people are shaped by other things besides when they were born. This is all the general things you ever need to know about it to make the connections!
First. There are 4 elements. Start with that and associate the obvious things that come to mind when you think of each element in nature. That's a big part of what the personalities of the people born under certain elements are based on. I have some obvious examples below, but you can apply whatever you feel...
The second part to know is that each element group contains 3 astrological/zodiac signs. Which have their own given characteristic, of which you can read in detail if you like. But below are the basics.
Cancer - kind, moody, clingy.
Scorpio - jealous, insightful, willful.
Pisces - creative, deep, sensual.
Aries - strong, ambitious, independent.
Leo - confident, passionate, selfish.
Sagittarius - intelligent, humorous, adventurous.
Taurus - materialistic, stubborn, pleasure loving.
Virgo - detail oriented, neat, analytic.
Capricorn - grounded, patient, critical.
Gemini - flirtatious, inconsistent, gossipy.
Libra - imaginative, understanding, diplomatic.
Aquarius - unconventional, humanistic, clairvoyant.