As, I was reading other

As, I was reading other threads, I remembered that my astrologer also said that I have ‘kaal sarpa’ yog and ‘pittar dosh’. I did nivaran for both ‘kaal sarpa’ yog and ‘pittar dosh’ with his help. It was around 5-6 years back. As far as I remember, he also added that sometimes ‘kaal sarpa’ yog can also do good; still don’t understand what good can it do when the name itself means bad/evil.