I'm wondering why bitcoin was made if there are too many currencies in each country, why would anyone add or make a type of currency in the internet? For easier and faster transactions or so ?
Dangerous can be in the terms of not getting full knowledge of how the market is and you just jump in without observing much - you will get your hands burnt at the most. But when you take time to observe and be patient, it will be a safe operation all through the trading or investment time spent.