TIps for using slack

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Where can I find the presenters' channels?

I don't see the channels. Where can I find them?

What can I do in the channels?

I would like to change some settings. Where can I do this?

Managing Notifications

I would like to turn off Slack sounds. How can I do this?

I don't want to receive emails from Slack. What should I do?

Managing Sidebar options

How do I send multiple lines in one message?