Joining random groups can be very risky, Telegram is just full of scammers, I know you can learn from Telegram but you have to be very careful, some groups you will join will just want to push you to invest in some site's, some will contact you privately claiming they are admin and they want to help you, if you are using telegam always avoid random messages you receive, most of them will say they want to help you and they will ask you to send them money, some of them will request for your private key or ask you to input your confidential details into a link, you have to be very smart and don't trust anybody you meet on social media.