[[MORE]] A lot of people wonder how compatibility is determined. Here is a chart that can break down the basics. The chart uses Aries as a starting point, but to determine your own compatibility, all you need to do would be to rotate the circle.
Astrology Marina: How to read your own Birth Chart / Astrological Horoscope. Provides a great intro into how the chart is structured and general significance of the placement of symbols around the wheel.
Many people like to work with planetary influences for their own healing as they can find these on their own astrology charts but also many know which ones are influencing their lives but are not sure how to balance them.