Rahu is all about Bravery, Illusion, Cheating, Lack of thinking, and so on.

Rahu Mahadasha coming at school days can make one brave but will make obstacles in studies. Even a native with exalted Mercury will find difficult to study. Upon making a person brave, Rahu will make him idiot. Actually, only idiots can be very brave, not intelligents.

Rahu works like an illusion. It will be like seeing everything through a mist or smoke. We cannot see and understand things as it is. It will be displayed to us in a different manner. An intelligent person can go mad, and may get interested in a wrong ideology during his Rahu Mahadasha.

Many new people, new friends, mostly friends from other language or culture could come in our life during Rahu Mahadasha. Some of them could be only with cheating intentions. If our Lagnesh is not so strong, we could be cheated badly.

During Rahu Mahadasha coming in prime age, if the Lagnesh and 6th lord are well placed in a beneficial manner, the native could cheat others and earn lot of wealth during Rahu Mahadasha, but not in a genuine way. If Rahu is well placed with a benefic planet and aspected by Jupiter, then the native will get plenty of wealth suddenly through genuine methods.

Rahu Mahadasha in old age will not give anything good for the native.

It is said that during Marriage matching, male chart with Rahu Dosha has to be matched with a female with Rahu Dosha. People who are not interested in astrology does not understand and gets confused about this.

Why Rahu Dosha chart has to be joined with another Rahu Dosha chart?

The answer is all about Rahu qualities.

If a person is having Rahu in Lagna or Lagnesh is conjucting with Rahu, then the person mind will be confused by Rahu, the person may be a liar, person of jealousy, cheater, may be interested in gambling, and lottery like incomes.

Only a person with same kind of qualities can manage to live with him. Else divorce will happen. other wise some tragedy may happen. To stop these kind of things happening, our ancient rishis advised not to match Rahu Dosha with a No Dosha chart. The same kind of analysis can be done for Ketu Dosha, Kuja dosha also.