Rahu and Ketu are shadow planets... and quite karmic! 
Rahu and Ketu show what past life karma you've completed already, and what karma you are here to create in this life time. Remember, "karma" simply means "action". Therefore, we can see what you spent time doing in previous lives, and what you are here to work towards in this life. 
Rahu brings unconventional thinking, foreigners, misdiagnosis, mystery, materialism, and insatiable desires. Wherever Rahu is in your chart, it will bring an obsessive quality to the house it's in and planets it's placed with. Ketu is the opposite. Ketu brings separation, isolation, moksha, and spiritual enlightenment. Ketu is what you've already achieved in past lives and what gifts you inherently bring into this life. 
Rahu and Ketu come together. They will always oppose one another in a birth chart. You cannot have one without the other. As the nodes turn and transit the sky, they will bring various karmic lessons into our lives. 
For questions please email me at AstrologyNowPodcast@gmail.com, visit my website Innerknowing.yoga, or follow us at AstrologyNow_Podcast on Instagram. 

Thank you so much.