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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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It does not matter whether it is from start or end, because the binary representation of a 32 bit number must be divided into 4 octets (each having 8 bits / 1 byte)
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Because input length maybe <32, we should convert binary to decimal started from end not from start. Maybe someone can say why, we should start from end?