Namaste Nitin Sir...🙏🏻 The recent video on Mangal dosh was very insightful and the role of Tikshna and Ugra nakshatras was explained Beautifully..!

I don't know much about Mangal dosh, but I have a basic doubt... My question is: Why is the placement of Mars particularly in 1,4,7,8,12th houses called as Mangal dosh..? As per my logic, Mars sitting in 1,4,7 & 12th houses have direct aspect(drishti) on the 7 house of married life... But this logic doesn't apply when Mars is in 8th house... And in one of your videos you've said that 8th house Mars forms a strong Mangal dosh... Please throw some light on this... Thank-you...🙏🏻