If you are working on a big Sitefinity instance with lots of websites, being maintained by multiple content editors, possibly in multiple countries, you probably need some sort of documentation to help them do their job easier and with less errors.
Maybe you want to add a simple instruction on a marketing page, because a Content block contains some specific markup, which needs to be observed? Or maybe a certain class should be used on a specific layout to achieve a specific effect? Or you want to add documentation that applies to all Content blocks? Or all custom widgets of particular kind?
Maybe you have it somewhere? In Confluence? Or some other external source?
In our experience people find it hard to navigate to the information they need and that's why we created Contextual Help - to make instructional information easily accessible, in one place and directly in Sitefinity!
If we find a topic in the current page language - we will show that, you can configure fallback as well.
Want to write a remark that the current content block contains something important?
Write that in the instance tab. It will only show for the current widget.
Want to let people know how they should use content blocks in general?
Write that to the widget tab.
It will show for all content blocks.