Because the upgrade process has so many steps, we’re trying to make it as clear as possible when to do what, and who needs to do which step. To that end, we’ve created a series of very short (1-3 minute) overview videos with graphics that illustrate the steps in the process.
The first video has a quick summary of the whole process. Then there are 5 additional videos, each explaining a phase in the process. These videos are embedded in the articles to which they apply, or you can go to the following article to view all of the videos: Upgrade overview videos for SharePoint 2013.
You can find links to all of our SharePoint videos on this page: Video demos and training for SharePoint 2013.
Let us know what you think about these conceptual videos for upgrade.