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• Split the editor (Cmd+\ on macOS or Ctrl+\ on Windows and Linux)
• Toggle preview (Shift+CMD+V on macOS or Shift+Ctrl+V on Windows and Linux)
• Press Ctrl+Space (Windows, Linux) or Cmd+Space (macOS) to see a list of Markdown snippets

For more information

• Visual Studio Code's Markdown Support
• Markdown Syntax Reference

Enjoy!