I want to buy a crypto coin. I don't have too much money. I want to invest something like 3k USD. Now I wonder what crypto coin should I buy and hold for almost one year. I want to hold that coin in this year, which is 2018 and I am planning to sell that in upcoming 2019. 2019 will be a big year for me, planning to get married    So please advice me and suggest me to the point.

Many many thanks in advance.