By default, Slack provides you with a Formatting toolbar and a WYSIWYG editor. I’m a big fan of writing in Markdown rather than WYSIWYG and use it everywhere I can. Fortunately, I can configure Slack to write in Markdown (or more accurately Slack’s subset of Markdown).
If you’re not already using Markdown, Slack probably isn’t the best place to get started but if you’re a Markdown fan like me I strongly suggest going to
Preferences(on a Mac, this is atSlack>Settings...)AdvancedInput options- and checking
Format messages with markup

The slack help article Format your messages in Slack with markup has more information including a list of what markdown formatting is supported.
Note: Slack refers to their subset of Markdown as “markup” (which I think is confusing).
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