Slack is a popular communication service primarily used in workplace environments. If you want to try it, you can create your own free Slack workspace and invite anyone you want. Here’s how to set it up.
To set up your own Slack workspace, head to www.slack.com and click the “Get Started” button in the top-right corner.
Click on the “Create a New Workspace” option.
Enter your email address and click “Confirm.”
This email address is used as your login name and as the contact address for billing information if you eventually choose to move to a paid Slack plan rather than the free plan. It’s also used to send you a six-digit confirmation code (to make sure it’s a live address), which you need to enter on the next page.
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Source: How-To Geek