Investing in any currency is an activity that, roughly speaking, can be done in two ways: the speculative, by means of short sales (buying and selling currencies several times in one day depending on the possibilities of the price going up or down), Or by developing a medium- or long-term investment scheme (i.e buying currencies and saving them for a longer period to sell them when appropriate).
To be able to take short positions, we need to understand margin trading. Trading on margin means we are trading with borrowed money. On exchanges like Poloniex, we can trade Bitcoin with a handful of coins (there are fewer coins offered for margin trading) with 2.5x leverage. That is, if we own 1 BTC, we can borrow up to 2.5 BTC to trade with. To be clear, this is not 2.5 BTC that we own. Now, on a trade that nets us 10% profit, we are bringing home .25 BTC instead of .1 BTC.
Never put all your eggs in one basket. Diversify. While the potential to earn more is increased with the amount of money you invest into a coin, the potential to lose more is also magnified. Another way to think about it is to look at the cryptocurrency market as a whole; if you believe that this is just the beginning, then more than likely the entire market cap of cryptocurrencies will increase. What are the chances that this market cap increase will be entirely driven by one coin vs. being driven by many coins? The best way to safely capture the overall growth of cryptocurrency is to diversify and reap the benefits of growth from multiple coins. Also, fun fact — Between January 2016 and January 2018, Corgicoin has increased by 60,000x, and Verge has increased by 13,000x. During the same period, Bitcoin has increased by 34x. While you would have gotten impressive gains from Bitcoin, expanding into other coins could have landed you potentially larger ones.