Not really a "trading group" per se, but a sort of subforum or "subreddit". If I needed a bit of opinions from the people concerning the bitcoin markets, I use r/bitcoinmarkets[1]. I personally really don't like using Telegram groups as most are spam-filled and or shady.

But as always, take every opinion with a grain of salt. Don't make your decisions solely from other people's opinions.

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[1] https://reddit.com/r/bitcoinmarkets