Every failure of human endeavor is invariably attributed to a Dosha (fault) in the horoscope. Some of these Doshas are well-known, while others are less common and thus less well-known. Whatever the Doshas in the kundli are, they have a strong influence on the horoscope.
In Vedic astrology, a Dosha is a conjunction of malefic planets that prevents the beneficial aspects of the horoscope from fructifying. It's like a flaw in your horoscope. Several of these negative Doshas in a horoscope can have a detrimental influence on the native at the same time. As a result, it's critical to recognize these Doshas, understand when they'll activate, and administer the appropriate karma correction.
There can be innumerable Doshas in a horoscope, but only the feared few are often deliberated. The Kaal Sarpa Dosha, Pitra Dosha, Mangal Dosha, Nadi Dosha, Putra Dosha, Grahan Dosha, Bhandhan Yoga, Paap Kartari Dosha, Guru Chandal Dosha, Angarak Dosha, Gandalmool Dosha, Shani Dosha, Shrapit Dosha, Kemdhrum Dosha, etc. are most known Doshas.
Any Dosha that is not properly treated can develop the ability to hurt the individual to any extent. As a result, the belief that one Dosha is potentially more damaging than the other is incorrect. As a small hole can sink a large ship, even a non-threatening Dosha in a horoscope might cause the native to suffer if left neglected.