However, you can make use of Telegram bots that can aid you in that endeavour i.e @tchannelsbot. I would also recommend a Reddit which asked this same question. Various people regularly comment with their channel links which you can click on and join.
How to find out a channel on telegram?
These are the some simple steps to find out a channels on telegram. I hope you understand. There are several ways to do so, it’s much easier to find one when it’s public, but you’ll need a link to the channel when it’s private.
Step 1: Open Telegram Messenger App.
Step 2: Tap on Search Icon
which is located in the top right corner on the screen.)
Step 3: Enter your queries or keyword.
Step 4: Click on Related Channel/Term.
Step 5: Tap on the join button which is appeared in the bottom area of the screen.
Step 6: Congratulations! In just 5 steps I explained how to join a channel in the telegram messenger.