Investing all you capital in one coins is very risky. You need to diversify it with in 3-5 coins to minimize the risk and befote buying you need to search the history , concept and study the chart of that coin.
Never invest all the money that you have in one altcoin. This is a great risk. It is better if you have at least 10-15 alts in your portfolio. It will guarantee you at least some profit.