Please tell me about some Karthika Masam Poojalu. I was told by some aunty that all days in Karthika masam like Karthika Somavaram, Karthika Mangalavaram, Karthika Budhavaram, Karthika Guruvaram, Karthika Shukravaram and Karthika Shanivaram have some significance. She also said that Karthika Pournami, Karthika Ekadashi, Karthika Amavasya also have some importance. explain me plz.