The best mantra during Shivaratri is the ‘Panchakshara Mantra’ – ‘namahshivaya.’ Most people repeat it as ‘om namahshivaya.’ Not just during Shivaratri but this mantra can be chanted at anytime. Just close your eyes and chant it. You can experience a different feeling – a calmness.
Most people want to know the result of repeating the mantra. If you are repeating a mantra to gain something, I don’t personally believe that it is going to be of any help.
Never expect miracles to happen by repeating any mantras. All mantras are meant to improve ‘Shradha’ – one can say it as concentration although it has a wider meaning. When chanted during meditation these mantras provide an inner strength. With the help of inner strength or shradha gained during chanting, you can improve your skills. This will in return help you in gaining both spiritual and materialistic wealth.