Question: Getting started - top commands

In reading through the Maple 11 "Getting Started Guide," on page 81 is paragraph 4.2, which is titled "Top Commands," the booklet lists and describes a number of commands such as plot, solve, fsolve, eval, etc., with out any comment. What is the significance of these commands among the many, and what is meant by "top" commands. Is there a hierarchy of commands? Or do they mean these are the most used or what? I don't understand what I am missing here or why this list of commands in included. Again, there is no discussion, just the table of commands.
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