Everyone starting with mantras should always start with Ganesha. He protects, grants peace, health and prosperity, removes obstacles to physical, mental, spiritual progress and his domain is the Root Chakra. He is one of the few deities that is a fierce warrior, an affectionate child, a celibate, a highly sexual lover - pretty much everything rolled into one.
So, the question is, what makes a mantra work then?
Mantra is essentially a phrase or a combination of sounds, often without any decipherable meaning - that represents a deity, or a concept (like the Vedic Mahavakyas that affirm the oneness of the individual self and the Divine Consciousness, etc.). Most mantras are sonic forms of deities, who in turn are divine archetypes. Deities are very real in a sense and equally unreal as they are also projections of the Higher Mind. They have existence in the macrocosm, and in the microcosm, as the two mirror each other anyway, right? Deities are ancient beings, expressions of the one Divine Consciousness, egregores, and aliens (in some cases) - all this is true. For example, Shiva is certainly a very ancient deity that has existed for a long, long time. At the same time, he is also the archetype of unbridled, liberated, non-dual consciousness. Some deities can be egregores (here is a funny example), created by mass adoration via the collective consciousness of millions of people (I try to not use the term deity for an egregore).
Between 2010 and 2012, Dalai Lama visited Seattle frequetly to hold some rituals. In one such ritual, he could sense my unease with some of the Tibetan mantras being recited and kept pointing to me and smiling. After the ritual, there was a discussion about the importance of pronunciation when it comes to mantras. One of his Western disciples asked a question: “I agree with this guy (me) to an extent but then how have these mantras worked for Tibetans for hundreds of years when they have been pronounced differently from their Sanskrit originals?”
DL looked at me questioningly, and below was my humble response:
DL seemed satisfied with this response. He frequently encourages his students to learn and master the original mantras, when possible, rather than the Tibetan ones, now that they have access to them.
It worked when I was chanting it for a little girl when her heart surgery was going on
Absolutely correct
Pronouncetion changes as per veda for vaidik mantras
In Rig-Veda as well as Yajurveda
I was curious about why this deity or other deities didn’t interfere when our creators the annunaki gods came to earth and started those wars.
And Is there any connection between them?
That is just one theory, of the many 
Who knows if this is true, or just subjective interpretations. Every culture has its creation myths, and the alien cults have theirs…
That is not exactly correct.
Pronunciation does not change. Enunciation does. Vaidika mantras do not follow the same rules as Tantric mantras, which is what primarily we discuss here when we say mantras (with Gayatri and Mrityunjaya being the exceptions).
For example, the famous Purusha Sukta is found in the Rik, Yajus as well as Atharvana Veda. The formation, the rules of enunciation are different between these. The words follow the same pre-Paninian Sanskrit, so the pronunciation is not different technically of the letters. Their enunciation is different as the svaras or intonation differ.
The three rules of enunciation - anudatta, udatta and svarita are defined differently not just between different Veda, but even between Shakhas of the same Veda (e.g. Shukla vs Krishna Yajurveda) - and these are passed on verbally across generations. And the enunciation differs between regions (Varanasi vs Kanchi, etc.)
Tantric mantras are less strict about pronunciation, but Nipun-type of quackery is unacceptable there as well.
I heard that if you chant om mani padme hum that your life will be easy. Is that true? How many times I have to recite it
I came to know about the world enunciation I wanted to convey the same English is not my native language
Shukla Yajurved Purushsukta sharing especially for you
Oh thanks, I am aware of it. I have studied both Rik and Krishna Yajurveda up to Krama patha.
One needs to keep repeating it all the time. Or recite as much as one can.
Very delighted to know that 
After reading about egregores I thought most of these hindu deities were egregores - I was wrong. so if they are ancient deities
Do you know their origins?
And why are these deities like shiva or Ganesha only in Hinduism and not other cultures?
It is.
At least 108 twice a day, dawn and sunset.
But if you really want to see rapid constant results
108 x 10 a day.
I recommend you this one too, one of my for ever most loved one lol and ver very powerful. Same repetitions as Mentioned.
Daimoku.
“Nam Myoho Renge Kyo”
(Nammyo horangay kyo) pronunciation
Thanks Luna. 
My favourite 
