Arbitrage trading can be described as the simultaneous purchase and sale of an asset in order to profit from discrepancies in its price. In other words, arbitrage traders will purchase an asset in one market, and then sell that same asset at a higher price in another market. In the context of the cryptocurrency market, arbitrage trading might resemble something like this:

TIP: A good first foray into cryptocurrency investing is the obvious, buying a major cryptocurrency like Bitcoin. After that, you’ll probably want to trade USD for crypto on an exchange like GDAX. Once you have done that, you could try trading BTC and ETH for other cryptocurrencies. Trading “crypto pairs” can be rewarding, but it is more complex and often more risky than just buying a single cryptocurrency as an investment.
Dollar-wise, as you can see – Litecoin’s price has increased along with Bitcoin (but less). A reminder about the majority of those quoting “Bitcoin has increased greatly, I’ll buy Litecoin”, buy Litecoin with FIAT (or by converting to Bitcoin, then to Litecoin right after – which is the same). Therefore, learning from the graph yet maintaining the same behavior, when Bitcoin’s value drops, Altcoins’ USD value will drop as well (although as a percentage it will probably be less, but it will still go down).
That bold green candle yells at you “you are the only one not holding me”. At exactly this point you will notice lame people flooding the Crypto forums and the exchanges’ Troll boxes to talk about this pump. But what do we do now? Very simple, Keep moving forward. True, it’s possible that many may have caught the rise ahead of us and it can continue raising, but bare in mind that the whales (as mentioned above) are just waiting for small buyers on the way up to sell them the coins they bought in cheaper prices. Prices are now high and it’s clear that the current coin holders only consist of those little fish. Needless to say, the next step is usually the bright red candle which sells through the whole order book.
No, the successful trader is not me. I’ve gotten lucky a few times and I’m still refining and trying out strategies; on the other hand, I’m part of communities of people who trade on a daily basis to grow their portfolios, and while some of the results can be attributed to luck, a majority of it is based on fundamentals, good habits, and experience.