What's the reason behind this advice, personally I have used multiple exchange for trading but there's just one that I enjoyed more and assuming I decided to chase a career in trading I don't mind using only one exchange for that if I'm getting exactly what I want. Some exchanges might favour you why other don't. Truth be told, not all exchanges are being honest, there are definitely some unfair activities going on that involves the manipulation of the market. Staying with one exchange has its benefits and the cons mightn't be that bad, probably like the exchange having down times when you want to trade.

What's the reason behind this advice, personally I have used multiple exchange for trading but there's just one that I enjoyed more and assuming I decided to chase a career in trading I don't mind using only one exchange for that if I'm getting exactly what I want. Some exchanges might favour you why other don't. Truth be told, not all exchanges are being honest, there are definitely some unfair activities going on that involves the manipulation of the market. Staying with one exchange has its benefits and the cons mightn't be that bad, probably like the exchange having down times when you want to trade