The major tool of astrology is kundali, kundali provides every detail about a person or Jatak. In kundali stars and their movement are read and analyzed. All the stars have their own categorization. Few starts or grah are considered as paap grah of harsh stars and few are considered as saumya grah or holy stars. This categorization depends on the nature of light they emit and their effect on the life of the Jatak on the basis of continuous analysis from thousands of years. This dosh can be of different types, for example, pitra dosh, shani dosh, pret dosha, mangalik dosha, kaal sarp dosha, aanshik grahan dosha, chandaal dosh, amavasya dosh, grahan dosh, kemdrum dosha.
Kemdrum dosha is known as destroyer dosha or maha satyanashi dosha. It can be explained that if moon is placed on a garh or house of the kundali and no other star is behind it or before it in kundali is known as kemdrum dosha. It is considered as a very effective and dangerous dosha, or can also be considered as daridra yoga.
Graham dosha is also an effective dosha of the kundali. When the moon is covered by rahu or ketu. Then the dosha appears known as graham dosha. The Jatak is very impatient and wants to finish the work in the middle in this dosha. He also lacks his confidence and believes on others, he feels parted from his mother.
Pitra dosha is also a strong dosha of the kundali. The Jatak feels that whatever he start can't finish. The plans are left incomplete, the person wants to finish but after all his efforts it won't work. This dosha is believed due to incomplete crimination of forefathers.
Shani dosha is also a dosha people use to feared off. But it is a time which comes in every person's life. Shani the deciding grah, people most feared off. Shani has a duration of 7 and a half year and also a small duration of 2 and half years known as laghu kalyankari dhaiya.
Kal sarp yoga one more dangerous dosha of kundali, when all the stars of the kundali are seated between rahu and ketu and rest homes of garh are vacant. Then such a dosha of kundali is known as kal sarp yoga. Because of incomplete knowledge of this dosha people are quite afraid of it. In it also all the tasks are left incomplete, it can be said a man will try for 100 percent but after achieving a goal of 99% he will be back on zero. Kal sarp yoga can be also of 12 types. All the 12 types have different symptoms and characterization, as well as the nivaran upay.