One of the things to know here is that cryptocurrency exchange is not part of the regular stock exchange. They are not the same as Wall Street and its exchanges, although they share same general mechanics. The number of best platforms keeps growing as the market is still forming, here is a top 5 list of cryptocurrency exchanges ranked by trading volume.
A quick look at the Bitcoin price over the last few years reveals a strong upward trend, but also times where the price was over and undervalued. Since most buyers and sellers are regular people and not professional traders, the cryptocurrency market is extremely sensitive to media hype and news stories. When the news is good, people rush to buy overvalued cryptocurrencies. When something bad happens, they panic and sell their coins at below their true value.

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.