This ~9:30 minute video (feel free to speed-up playback) introduces the structure of an HTML document and introduces block and inline tags. It then shows you how to add tags to an html document (like a discussion post in Canvas). The content from this presentation is pretty basic. It distinguishes between block and inline tags. It also introduces heading, paragraph, division, unordered list, strong, line break, image, and span tags. All tags mentioned in this presentation (with the exception of division and span) are available in the WYSIWYG Canvas discussion thread editor. However, knowing how to read HTML tags is integral to understanding CSS attributes and how to use them.
Take some time to play with HTML tags in the HTML Discussion thread this week. Feel free to begin by using the WYSIWYG editor to add headings, bold and italic text, and ordered and unordered lists.
Afterwards, review the tags using the HTML editor </> button at the bottom-right of the discussion post. Look for the beginning and ending tags. Add additional content between those tags. Remove a tag and see what happens to your text.