Devi Durga mantra
The most chanted mantra of Maa Durga is following. The meaning of this mantra is as following.
Sarva-Mangala-Maangalye Shive Sarvaatha-Saadhike I
Sharanye Trayambake Gauri Narayani Namostute II
We bow to you O Devi Narayani. You are the the auspicious for everyone, you bring happiness . You are the one who completes every work for everyone. You are protecter of everyone.
You are the one with 3 eyes and a beautiful face; We salute you, O Narayani.