Making of 1 Bitcoin in a month is not a difficult task. But you should have starting balance of 0.1BTC. If you do not have in your hand then buy from some exchange or friend or people. After buying of bitcoin trade in the exchange like Bittrex or Poloniex or Kraken. But, first of all look out the price behavior of various coins that you are being going to trade.
You say that making one bitcoin in month is easy? It really isn't easy, even if you have starting amoubt of 1 bitcoin or 0.1 bitcoin. Every way that lets you earn that much in onr month is really risky, trading is probably least risky way to earn that much, but if you don't have skills or knowledge you won't earn that much in month, you will probably only lose at start.
Its not easy to earn 1 btc even from trading as you cannot control the price movements and you never know when the coin will pump and to make good profits in trading you also should have decent capital to invest and again there is no guarantee that you will make profits each and every time.