Navratri literally means “nine nights.” These nine nights are counted from the day after new moon day or Amavasya. These first nine days of the lunar cycle are considered feminine. This is a special time for Devi, who represents the feminine nature of the Divine.
The ninth day is called Navami. The one-and-a-half-days around the full moon are a neutral time. The remaining eighteen days are masculine in nature. The feminine phase of the month is about Devi. That is why in the tradition, all worship up to Navami is dedicated to Devi.
There are twelve nine-day periods in a year and each of these is focused on a different aspect of the feminine Divine or Devi. The Navratri that comes around October is considered the most significant one because it is dedicated to Sharada, the goddess of learning.
Among the many things that a human being can do, this tradition lays greatest emphasis on learning. Other creatures can run faster than us; they are stronger than us; they can do many things that we cannot do – but they cannot learn like we can. The pride of being human is that you can learn just about anything – if you are willing.