Om Namah Shivaya (Panchakshari)
Shiva
Naam Japa (Name Chant)
Easy - Anyone can chant
Safe for All
ॐ नमः शिवाय
Om Na-mah Shi-vaa-ya
Meaning
I bow to Lord Shiva, the auspicious one.
When to Chant
Daily, during meditation, for peace and focus.
Best Time: Anytime, especially Mondays and Pradosham
Benefits
Brings inner peace, removes negativity, aids meditation, purifies the mind.
Source
Shri Rudram, Yajurveda