If what you mean by trading on Telegram is what I think you mean which is peer-to-peer exchanging of coins, then i wouldn't advise anyone to do that.
You better use the popular exchanges like Paxful to trade.

But if you actually meaning buy/sell speculation trade like its done on Binance, then Telegram isn't a bad platform to do such as long as you are using a legitimate service. This, I wouldn't advise beginners to do but only traders that have done their homework and are comfortable using custom tools like bots to trade.