Putting it all together
The signs, planets and houses come together to make an individual person: you. Each have their own qualities that mix to make a unique blend. For instance, we know Mars represents action and motivation. That is the 'what'. Then if we take Mars and put it in Libra, we can answer the question 'how?' and 'why?'. We can see that we have someone that is motivated to create harmony and fairness, and is motivated to interact with others ('relatedness'). If we take Mars in Libra and we put it in the 'where' of the 9th house, we may see a person that has made a personal philosophy surrounding the ideals of harmony and fairness, someone who pursues these ideas and lives by them. We can do the same thing with each of the different combinations of planets, signs, and houses and start to weave a more complex picture that make up a person, not just the flat sun sign explanations we see in our daily horoscopes.