You can only really work on one cell at a time. However there are lots of ways to then copy that work to other cells. You could also have cells being equalled to the contact of other cells. So when you change the data in one cell, the other will also change. Spreadsheets are useful because changing one thing usually has the effect of changing lots of other things that are depending on them.
cell or formula bar!
Yes, the use of forms is one commonly used way to edit and enter data.
Pressing the F2 key will enter Edit Mode for the active cell in Excel.
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input device
The Formula Bar.
If you see Ready on the status bar, it means Excel is ready for you to start typing something into the active cell. Once you start typing, you will see Enter there, or if you edit a cell you will see Edit there.
Click on the cell and edit the contents in the formula bar at the top of the screen, double-click the cell and edit in the cell, or click on the cell and press F2 to edit within the cell.
You cannot. The whole point of Excel Viewer is to be able to read-only view an excel spreadsheet, even though you do not have Excel. You will have to purchase or find a copy of Excel if you wish to edit the spreadsheet.
Yes.
Select the data in Excel and then use one of the copy methods, like Ctrl-C or using the copy command from the shortcut menu or the Edit menu or the Main ribbon. then go to the Word document and do a Paste. The data will appear in a Word table. You will lose the formulas and just get the data values and the results of the formulas.
You can just select what you want to change, by clicking on the Formula Bar or pressing the F2 key to start the editing process.