Apple has posted a series of video tutorials called "Find Out How." There are several videos within each of the six major categories: Mac OS X, Photos, Movies, Web, Music and Documents.
In addition to the video tutorials in each category, there are many more text tutorials.
Each video tutorial runs about 90 to 150 seconds. For example, in the Documents section, there are videos on Formatting a Document, Formatting Text, Creating a Table of Contents, Using Apple Designed Themes, Adding Photos, Movies, and Audio and, finally, Starting a New Spreadsheet.
Most welcome is a link for users to send feedback on each of the videos. The videos are colorful, easy to follow, and very well done - as is Appleis custom. This is a page to bookmark.