What is Spirituality?

Bhagawan Ramana Maharshi has put it in four simple words.
Deham (देहं)
naaham (नाहं).
Koham (कोहं)?
Soham (सोहं).

What does it mean?
Deham naaham = I am not this body
then,
koham? = who am I?
soham = I am That

What is Shubhodayam mean?

It is conjugation of two words. Shubha (शुभ)+ udayam (उदयं). Shubha = good or mangalam (मंगलं). Udayam = to rise.When someone wishes or says shubhodayam, then it means let the good or mangalam rise. And, the person who utters also will have a gesture in the form of folded hands nearer to the Heart (not the physical heart) or just a hand touching the Heart. This is a old form of gesture stating that one can be peaceful only when one concentrates on the Heart and not on one's mind or thoughts. This is one way of entering into Silence and wishing the other also to enter into Silence, so that only the Silence prevails (actually awareness of Silence). When the awareness of Silence happens then peace prevails. There is also a Buddhist tradition stating ami tofa  meaning 'let peace be with you'.

What is the use of technique on Spiritual Path?

All techniques on Spiritual path are like vehicles which will lead you till the house on the main road. Once you reach the house, you will leave the vehicle outside and walk alone into the house. Similarly techniques help you to control the mind and once it is done, you leave both the technique and mind; and walk alone in Silence into the house of Stillness. Once you are in the house of Stillness, you know everything, then no one need to tell you anything. You know what the Truth is. No one need to confirm it.