Telegram is full of paid shills trying to make themselves worth the money services pay them. I would stick to the reputable ones because that's the best way to avoid getting sucked into a scam.

I'm not saying the site that has been recommended to you is a scam, but your funds are on the line, so better be cautious. If you're really interested in CFD trading, use Robinhood or eToro, both reputable and reliable platforms.

If you think you're ready to go one step ahead and you have coins already, you could choose to go with BitMEX, but ONLY if you are familiar with leverage trading. If not, then stick to the aforementioned platforms.