One of the best places to find gems and do trading without too much volatility is Cryptopia.
In my opinion Bismuth is gem, cause it's not yet on other exchanges, and it's pretty stable and easy to trade.
So best tactics would be to trade gems like that, accumulate more, it get's listed on other exchanges and you earn big.
Disclaimer: I'm not associated with Bismuth's or Cryptopia teams but hold their coins. This is not financial advice, just my personal opinion.
Well, I won't argue. I've heard about Cryptopia but haven't dealt with it.
And Bismuth is a sort of new coin, as I understand... Well, every cryptocurrency exchanges wants to be considered as the best place for trading. The demand is high, so there are many opinions. What I good for one person may not be good for another. You believe that Cryptopia rules. And I can say that
CEX is good as well. I'm using it and the exchange suits my needs quite well.