I trade on the crypto market, the method is definitely the same as most other crypto traders. Because if you take it simply, to trade in crypto, basically buy when the price goes down and sell when the price goes up. This is the basis, be it in the short term, medium term and long term. But if taken in detail, trading on the crypto market is indeed quite draining. Because it requires analysis (fundamental, sentimental, and technical) of the crypto asset that you want to buy.
For now I use exchange or market binance. The reason I use Binance, is because it is currently the largest crypto exchange in the world, and has a very large trading volume. So if it's a matter of trust and about the features in it. In my opinion, Binance is very reliable and the features in it are very complete.
What you mentioned is called copy trading, and you can indeed find copy trading, one of which is in the Telegram group. But to enter the group, you must pay in advance according to the amount requested by the group administrator. And as for the results, I also don't know for sure, because I've never tried it, so I just know. But most likely using the copy trading platform, in my opinion it is reliable. That's because the platform contains people who are experts and competent in crypto trading.