In your Canvas RCE, the Page Title acts as Heading 1.  In the RCE ribbon, use the Paragraph button to select additional heading styles.  To create lists, use the Ordered / Unordered List button (both highlighted in orange).

screenshot of the Canvas HTML editor that shows how to add proper Headings and Lists to a document. Lorem Epsom text is displayed as an example

Keep in mind these best practices for Headings and Lists:
  • Use properly formatted Headings to structure your documents and/or web pages (H1, H2, Normal, etc..) 
  • Use either bulleted lists or numbered lists to group related items
  • Always use the list button when making a list.  Do not create lists with the number and letter keys.