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You don't really need a full course to understand Bitcoin, so what exactly is your requirement?

i need to know how to buy & trade

For starter make your account on Bittrex and Bitstamp. Bittrex is exchange for cryptocurrencies and Bitstamp allows to purchase crypto with USD.
Follow @jerrybanfield for his cryptocurrencies articles including Bitcoin and also exchange suggestion for trading. If you find any difficulty in any thing, you can still ask me anytime.

do you know any youtube channel?