1) Which cryptocurrencies do you trade?
bitcoin is the fixed one and all the rest are changing based on which coins are worth buying at that particular time.
2) Which exchanges do you usually work on?
bittrex
3) Which strategies do you use in your trades? Does it involve Arbitrage trading? What's the most difficult part of it?
most I am looking for potential in altcoins to buy before the rise and sell on top, I tried some analysis but they usually don't work on altcoins.
and about arbitrage it is much harder and less profitable so I am not a fan of it.