Context Parent is an item, shown as a Parent, that should not be displayed in the grid, as it does not belong there (based on the grid source), but nevertheless it is displayed (in blue) to help get the item context.
e.g. A ToDo grid may show the relevant contact as a context parent.
Use Grid > Context Parents to toggle display.
Fields are used to store values. Think of them as columns in Excel, except that removing a column does not delete the content!. Details here
The Source and Filter determine which items are displayed in a grid. Use the Source bar to modify these (Alt-S) Details here
A form is is a grouping of Fields that shows in the Properties Pane. You can give these fields "default" values and then create a new item with these values or apply these values to selected item(s). Details here
The glossary feature will highlights known terms and provide definition and additional info when the mouse hovers over it. You can contribute too!
Grids are used to display items. Currently, they are the main view of your information. Details here
Items can have sub-items. This is called a hierarchy. Take the Contacts grid for example. Flat mode (hierarchy off) would display all contacts in a flat list. Regular hierarchy would arrange your contacts placing children under their parents. Full hierarchy will do that too, but also show all parent's children, not just contacts
Hoisting is a feature which allows you to focus on a few items, away from the full grid hierarchy. Details here.
HTML Export can be used to print items + columns with or without the HTML pane content. It can also be used to mail-merge items using a template and output this merge as a document or as individual emails. Details here
Import is the process of taking external data (typically from other apps) and inserting it in the current IQBase. Details here
An IQBase is your InfoQube file. It is not a server file, it is simply a local file (extension .sndb), much like a .doc or .xls file, except that it support multi-user simultaneous access.
Items are the basic information element of IQ. In grids, they are represented by a line (e.g. like a row in Excel). In Calendars, they are represented by a time slot. Items can be assigned values using Fields. Details here.