If you want to solve a problem, you have to go to the source from which it originates! And it is also helpful to know the areas of your life impacted by that problem and when you are likely to confront it!
Consciousness condenses into denser and denser layers before it finally takes the form of our physical incarnation!
Astrology illustrates this particular point beautifully with the Planets (Grahas) interacting through the Nakshatras to begin to create the Cosmic and Karmic drama through the Signs (Rasis), which then further impact our existence through the various areas of life indicated through the Houses (Bhavas).
But before the state of material incarnation comes the interaction of the Nakshatras, which set the tone of the condition in which various factors of our lives will evolve. This happens before the Signs and before the Houses and is an important factor to understand!
Rahu and Ketu are the main Karmic Factors in the Horoscope! That is the reason that understanding the Nakshatras that Rahu and Ketu are placed in becomes so vitally important to integrate! It helps us to more deeply fathom the meaning of the lesson we are each brought into existence to learn, integrate and hopefully use to graduate from this Great Academy of Existence!