Rahu / Dragon’s Head in astrology

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Rahu is not actually is planet or a visible body in the sky. It is a shadow planet. Rahu is also called the dragon’s head. The motion of Rahu in kundali is in opposite direction than the other planets. 
Rahu makes a person want material pleasures. 

There is much debate about exaltation and debilitation signs of rahu and ketu. Rahu is strong in Taurus, Gemini and Aquarius.

Rashis ruled by Rahu:  –  
Rahu Exaltation Rashi : Taurus
Rahu Debilitation Rashi : Scorpio  
Nakshatras ruled by Rahu : Adra,  Swati, Shatataraka 
Rahu is karaka for : Material pleasures 
Friends :  Mercury, Venus, Saturn  
Neutral: Jupiter 
Enemies:  Sun, Moon, Mars  
Gemstone: Hessonite (Gomedha)
Numbers ruled by Rahu: 4 
Marankarak house for Rahu: 9th house