In many areas of the user interface, a small informational window appears if you hover over an item. If you are hovering over a link to a record, the snapshot will contain some basic facts about that record. For example, hovering over a link to a Project record will show the Project's name, main assignee, current phase, and creation date. Almost all record links behave this way. This feature does not apply to record links in calendar views, or lists of embedded records. This feature can be customized by administrators to display select information. For further detail on this functionality, see Custom Hover Popups.
On every page, online help is available by clicking the Help button in the record toolbar. In many cases the online help that appears will be specific to the page you are on; in some cases a more general help screen will appear.