here are at least three ways, though only one of them looks rational today. First, you could mine your own BITCOINS. Second, you could buy some from an exchange. Third, you could buy shares in a fund that has invested in bitcoins.
Please note that answering your question is not a recommendation, and I am not qualified to give advice on investments. But a quote on David Birch at twitter might change your mind “one doesn’t invest in bitcoin, one gambles on bitcoin”. but still i myself am getting income on it so what can i say its a good choice and a bad choice, that's your choice to decideYOU CAN GET TO KNOW MORE AT ->https://www.theguardian.com/technology/askjack/2017/jun/29/how-can-i-invest-in-bitcoin