Devi Shailputri is Worshiped on First Day of Navratri

Vande Vanchhitalabhay chandrardhakritshekharam |
Vrisharudham Shooldharam Shailputreem Yashasvineem ||

Almighty Durga is glorified with name 'Shailputri' as her first form. Navratri begins with worship of devi Shailputri. As she is the daughter of Parvat Raj Himalya (King of mountains), she is admired with name 'Shail Putri'.

Goddess Durga is personification of Shakti (power) and manifests herself in nine forms. These nine forms of Durga are religiously Worshiped one by one during nine days and nights of Navratri. Devi Shailputri is first among nine embodiments of Goddess Durga and is worshiped first during first day of Navratri. Her glory is incredible. She is the Goddess of purity. With her veneration, Navratri is given an auspicious start. She is also a form of Mother Nature (Prakriti). Worshiping this Goddess on the first day of Navratri Pooja, devotees enters in Moolchakra.

Devi Shailputri is worshiped along with Mahadev, as she is the consort (wife) of Lord Shiva. She is also the mother of Kumar Kartikeya and Ganesha. As she is Prakriti, she looks after all living organisms including human beings, animals, trees, shrubs, plants and even tiny living things on Earth. She holds a lotus flower in her left hand and a Trishul (trident) in her right hand. A half moon decorates her forehead. Parvati and Hemavati are other names of Goddess Shailputri. She rides on Vrishabha (a bull), the procession of this Goddess.

Legend behind incarnation of Devi Shail Putri

According to Shiv Mahapuran and other Hindu mythologies, Devi Sati, daughter of Prajapati Daksha, was got married with Mahadev. But King Daksha was completely not in favor of this marriage. One day, he organized a Maha Yagya. All deities and near dear ones were invited except Shiv and Sati. Finding this, Sati got deeply hurt and realized that her father was only insulting her husband Shiva. In this intolerable situation, she scarified her body burnt in fire of yogic Yagya. This sight was extremely painful for Mahadev. He made himself isolated from all and went for a penance of long eras. Without him the whole universe was in disorder. But, re-birth of Sati with name Parvati at home of King Himalaya nurtured rays of hope. However, it was very difficult for Parvati to get her Lord Shiva, as Mahadev lost himself in densest of Sadhna.

With mammoth efforts and immense devotion, Devi Parvati began her search and journey toward Lord Shiva. After many endeavors, she blessed with a re-chance to marry with Mahadev. Thereby, Shailputri symbolized herself as a true Goddess of root chakra. Her awakening was toward establishing universal love with Lord Shiva that glorified her as the Goddess of awareness.

On the first day of Navratri, devotees place enters in Moolchakra and worship Goddess Shailputri to establish dedication keeping Mooladhar in mind, and commence Durga pooja auspiciously. Jai Devi Shailputri.

Reference:-http://goo.gl/o6B1Hu