What's the Idea Behind How-To Topics?
So what does a how-to do that the Help file doesn't do? The answer is that the Help file (and the User Guide, which contains the same content) is reference oriented: Its table of contents is organized from the point of view of commands and features, not the actual tasks you need to do. But if you're new to Photoshop, you may not know which feature Photoshop provides for a certain task. In this way, the how-to topics built into Photoshop can help you get started.
By writing your own how-to topics, you can make Photoshop more directly relevant to your colleagues or students by creating topics that are immediately related to common tasks at your organization or school. Your how-to topics can be as deep as a complete tutorial or as simple as a list of links to helpful topics on the Web.