What exactly Lilith symbolizes in the birth chart? Symbolizes the dark side of our nature, what is hidden even from ourselves. Our partnerships, our fears, psychic stability, sexuality also our wishes, fantasies, frustrations but also our limitations.
Furthermore, the lessons we need to learn the in hard way, sacrifices that we have to experience. It is the point through which the "Force Majeure" enters into our lives and shapes our spirit.
Aspects to Lilith built in Natal chart are very important and orbits (distance) must not exceed 2 degrees. Conjunctions are naturally the strongest. The sign in which Lilith is, describe pattern by which it will be manifested in our life.
The house where Lilith is in the natal chart will describe through which power will act.