With regards to part 2 of your question, 'so' is often formally taught as being a classifier and thus not to be used to start a sentence. That said, many very educated native speakers of English do begin sentences with 'so' and other coordinators. So, whether it is right or wrong really depends on your perspective, your style, or which publishing company is being being used.
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MVBThe word "in" implies that the thing is already in place. The word "into" means that it's going in a certain direction right?In most cases, yes. "into" implies motion. "in" implies position. Nevertheless, "in" is also sometimes used in cases of motion, though "into" is preferable. But "into" is not used in cases of po