O que significa at the very beginning
our very soul
this very place
why does the word very is used this way?
¿Por qué se utiliza (very) en otras ocasiones que no significan (muy)? ?

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It's emphasis. It sounds more dramatic, and will hold an audience's attention better

"At the very beginning". You could not go further back than the moment the speaker is talking about. If you say, "I am at the beginning of a movie", you might be a few minutes in. But if you say "I am at the very beginning of a movie" then you have not watched any of it yet. It also sounds more dramatic. This makes me think of a narrator of a book or movie

"Our very soul" emphasizes that it is OUR SOUL. The speaker is emphasizing how special something is (maybe like an action or event) because it has to do with our soul. It adds more weight to the sentence. It makes me think of a priest in church.

"This very place". Again, "very" adds more weight and creates drama. The speaker means that they are talking about THIS place. No other place. It makes me think of a historian in a documentary.