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.
On cryptocurrency mining: As noted, one way to invest in cryptocurrency is via cryptocurrency mining. That is a valid way to start investing if say you love computer gaming and need a new rig and want to invest in small amounts of cryptocurrency while maybe making back some of the cost of the rig (and maybe even breaking even) but that is an entirely different subject. The average investor will want to trade USD for cryptocurrency on an exchange and avoid the complexities and investments of mining. In all cases, unless you already have a good rig with a great graphics card, you’ll need to put down USD upfront anyway.
For myself, and most crypto traders, the goal is to increase the amount of Bitcoin we own. I don’t care about the US dollar, at least not directly. When I look at the price of a cryptocurrency, I look at it in terms of BTC. For example, right now the price of 1 ETH (Ethereum) is 0.049 BTC. My trades are based on that price, not the fact that 1 ETH is $304.
Daytraders try to utilize special short-term course fluctuations. In the crypto space, this brings them profits between one and three percent. On other values they lose money. It’s almost a zero-sum game. Allegedly, good day traders average one to two percent in profit per day. We tried it and we are evidently worse than the statistical probability.
You’ll find that different exchanges cater to different markets. Today, most countries have at least one cryptocurrency exchange specializing in their own currency. There are exchanges that can accept New Zealand Dollars in exchange for bitcoin, for example. Other exchanges are known for certain pairs. Bithumb, for example, has particularly strong liquidity in the ETH/KRW (South Korean Won) pair at the moment (and it’s easily the most popular cryptocurrency exchange in Korea).