Can't find what I'm looking for

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I've been interested in using Sanskrit chants. But I don't know where to start... how do I find the word that achieves what I'm looking for? (I don't have a goal right now, it's just a general question.) Does anyone have any good sources? All I can find are lists ov Yoga mantras, and they're mostly all the same. Are they more powerful than the runes?
Also, is Sanskrit chanted letter by letter, as opposed to the whole word?

Thanks in advance.
Hail Satan!