I'm not really sure if arbitrage trading is still profitable though, I mean in 2017 yeah, you can do it, buy from some korean exchange and then go and sell it in US exchange.

But now the game has changes, day traders or arbitrage traders are using bots now, so it's hard to compete with them if you are going to start with it. So if you are inexperience then most likely you are going to lose money in the beginning and now sure how you can sustain this kind of trading strategy as there are competitions, just saying.