After you get a grip on the planets the houses the signs and the aspects you still have to put them all together to come up with an interpretation. Each placement will be modified by various chart factors. Because of this fact every Leo would not be the same.
To begin with synthesis you need to understand how each part works as an individual and how they can be broken down into groups .Each sign is governed by a planet, some signs are governed by two planets and some planets govern two signs.
Signs/Ruler :
Mars
Venus
Mercury
Moon
Sun
Mercury
Venus
Mars/Pluto
Jupiter
Saturn
Saturn/Uranus 
Jupiter/Neptune
signs ruled by same planet:
Venus
Mercury
Mars
Jupiter
Saturn
Everything in life has duality a polar opposites. Like up/ down right/ left open/ close off /on hot /cold … the list goes on and on.
The following is a list of the signs and their opposites:
Aries – Libra
Taurus – Scorpio
Gemini – Sagittarius
Cancer – Capricorn
Leo – Aquarius
Virgo – Pisces
Signs can be distinguished from one another in several ways. The key to understanding how the sign works for you or a particular chart is knowing how they can be grouped together.
Signs can be divided into sets of two(polarity), three(element), or four(mode).
Starting with a sign (and its opposite)
The first division is that of polarity. there are(2 groups) six ACTIVE and six PASSIVE signs. In order of the zodiac polarity alternates with each sign.
Active signs(-/masculine):
Passive signs(+/feminine):
The next division of signs is into groups of three. The signs in their Trigons are as follows:
FIRE TRIPLICITY
EARTH TRIPLICITY
AIR TRIPLICITY
WATER TRIPLICITY
The next division is into groups of 4 is known as the
QUADRAPLICITIES is as follows:
CARDINAL
FIXED
MUTABLE
Any sign within a group will share same traits and work well together.The signs are a progression of life that flows in sequence. understanding previous and following sign will help master current sign.
All this delineation is prior to incorporating houses, planets and any aspects. The houses can be grouped. First the houses can be grouped by elements.
The Fire houses are the first house , the 5th house & the 9th house.
The Earth houses are the second house . the six house & the 10th house.
The Air houses are the third house , the 7th house & 11th house .
The Water houses are the 4th house, the 8th house & 12th house.
Next the houses can be grouped by their modes:
Cardinal houses are the first house the 4th house the 7th house in the 10th house .
The fixed houses are the second house the 5th house the 8th house in the 11th house .
The mutable houses are the third house the six house the 9th house and the 12th house.
* Note that the Cardinal houses are angular the fixed houses are succeedant and the mutable houses are Cadent.
The houses can also be grouped by developmental stages of life .The Life houses are houses 1, 5 and 9.
The Substance houses are houses 2, 6 and 10 .
The Relationship houses are houses 3, 7 and 11.
The houses of Endings are houses 4, 8 and 12.
Each sign is associated with a house the signs position in zodiacal order represents the house that they refer to what that means is
Aries represent the first house
Taurus represents the second
Gemini represents the Third
cancer 4
Leo 5
Virgo 6
Libra 7
Scorpio 8
Sagittarius 9
Capricorn 10
Aquarius 11
Pisces 12
Although they can indicate the same factors , a sign and a house differ. Aries implies the first house and Mars and for synthesis purpose when you see Aries you think the first house and Mars , they are different .The Planet are the actors in a play of life the signs are the type of character that they will play and the houses is where this will all play out so they’re all different even though they’re associated with each other.
The 1st house is the house of self-identity the personality your outlook on life your physique the way you appear to people when you first meet them.
The 2nd house represents values earned income material things .
The 3rd house represent siblings neighbors short distance travel Communication.s of all types .
The 4th house represents home family your roots traditions what you call home
The 5th house is the house of creative expression Hobbies Sports sex without commitment children art .
The 6th house is the house of work health pet diet daily habits.
The 7th house the house of one-on-one Partnerships legal dealings enemies known enemies marriage partner business partner relationships in general.
The 8th house is other people’s money , sex, the occult , taxes , inheritance, death , loss , rebirth and transformations .
The 9th house is the house of achieving /Goals /Higher Learning /religion /law /philosophy /foreign lands /long distance travel and luck.
The 10th house is a house of profession, social standing , prestige, corporations and politics.
The 11th house iis house of ideas /dreams/hopes & wishes / friends /groups/bonus or residual income.
.The 12th house is house of self undoing , large corporations like jails , institutions and hospitals Repression, secrets, betrayal /behind-the-scenes type action , spirituality , dreams and trickery..
Each house is on an axis with the opposite house so consider them as a pair when interpreting. With the first house the key to resolving the problems is likely in the 7th house- the second house in the 8th house–3rd house the 9th house- 4th house the tenth house-the 5th house 11th house-6 house and the 12th house.
The first six houses are internal self-driven and the last six houses are external or other driven. Houses 1 thru 6 is self and houses 7 thru 12 is others. 1st house is self/7th house is Partners – second house is personal resources /8th house is other people’s money 3rd is lower mind/9th is higher mind- 4th is private life /10th public life-5th is individual happiness /11th is group pleasure-6th is daily living /12th is spirituality and subconscious living
each house is also placed in a specific quadrant the four quadrants are as follows
quadrant one ( houses one two and three ) : awareness of self
quadrant 2 i(houses 4 5 and 6 ): integration with your immediate environment
quadrant 3 i(houses 7 8 and 9 ) :awareness of others
Quadrant 4 (houses 10 11 and 12 ) : integration to society
The southern hemisphere is the upper half of the chart houses 7 through 12 :How we operate in the world
The lower half of the chart is the northern hemisphere and it’s houses 1 through 6 .:How we learn about the world
The Eastern hemisphere is on the left side of the chart houses 1 , 2 , 3 , 10 , 11 and 12 : Proactive
The Western hemisphere is on the right side of the chart houses 4, 5 , 6 , 7 , 8 and 9: Responsive
Here are the signs with their associated ruling planets ,house and quadrant :
Aries Mars 1 East
Taurus Venus 2 Northeast
Gemini Mercury 3 North Northeast
Cancer moon 4 North
Leo Sun 5 north northwest
Virgo Mercury 6 Northwest
Libra Venus 7 West (traditional ruler Mars East South West)
Sagittarius Jupiter 9 South Southwest
Capricorn Saturn 10 South
Aquarius Uranus ( traditional ruler Saturn) 11 South Southeast
Pisces Neptune (traditional ruler Jupiter) 12 Southeast
When interpreting chart you’re looking for themes between planets & house
planets / house
A planet influences the matters of the house in which the planet is located and by virtue of rulership a planet has an impact on any house that begins with a sign that the planet rules.
planet/ sign
Planet =verb
“WHY”
Expresses drive that people have in common. Represents energy and action.
Sign=adverbs
they modify the expression of the planets
“HOW”
Houses are WHERE planets energies operate
