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I have one Question? Why when we talk about Cryptocurrency we only think about BitCoin There Are A lot of other currencies. Any One For answer my question?

Think of it this way. bitcoin is the daddy coin and all the others are the children. One day in the future one of the junior coins may be more important than bitcoin. Bitcoin has many shortfalls but most of us buy bitcoin to get the other coins so it is the most important coin for the time being.