With the Insert Menu you can insert additional Cells , Rows , Columns and Worksheets . You can also insert a Chart . Page Break allows you to insert a page break where your cursor currently is. Function allows you to write functions within your spreadsheet. Name will allow you to specify a name that will be within the workbook.
Comment is described above.
Picture allows you to insert a graphic either from a file or from Clipart, just to name a few. Object will allow you to insert different objects such as those listed when you select Insert Object . Bookmarks allow you to insert bookmarks. Hyperlink allows you to insert a hyperlink. AutoFormat will allow you to quickly format a range of cells.