The divisions in the chart are known as the 12 houses which are determined by the position of the ascendant. The ascendant is the sign which was on the horizon at the time of birth.
When reading a chart the planets are the primary concern. The sign they are placed in affects the expression of their qualities with the house they are placed in telling what part of life their influence will be strongest in and the aspects formed between the planets show how their dynamic forces interact.
The most common use of an astrological chart is the natal chart, which shows the position of the planets at the moment of a persons birth.
First House (Ascendant) Personality, appearance, and outlook. How one views the world.
Second House Inner goals and values. Wealth and Money.
Third House Friends and communication. Memory and cognitive ability
Fourth House Home and inner self. Property.
Fifth House Self expression and creativity
Sixth House Professional side and work
Seventh House (Descendant) Relationships and partnerships
Eighth House Magic, psychism, sexuality and addictions
Ninth House Higher education, spirituality and travel
Tenth House (Midheaven) Reputation and fame
Eleventh House Wishes, goals, and ambitions. Friends and social contacts.
Twelfth House Subconscious issues. Inner transformation and what holds one back. Principle life lessons.