On the first day of Navratri, which is also known as Pratipada Tithi, devotees of Maa Durga observe the Navratri fast and worship the first incarnation of Goddess Durga – Shailputri.from Top Lifestyle News- News18.com https://www.news18.com/news/lifestyle/navratri-day-1-arrival-of-maa-shailputri-marks-the-beginning-of-pratipada-tithi-2974433.html