Yes, the active cell is outline in black.
A cell that is outlined in green is normally the second cell referenced in a formula, when you start to edit the formula. It does not have to have any data in it. You could be referring to the active cell, but that is not outlined in green and again it does not have to have anything typed into it.
Yes, in many spreadsheet applications like Microsoft Excel, the active cell is typically outlined in black to indicate that it is currently selected for data entry or editing. This visual cue helps users easily identify where their input will be directed. The outline may vary in color or style depending on the application settings, but the black outline is a common standard.
thin black cross
the active cell
In Excel, a range is considered active if it is highlighted and outlined with a border when selected. You can identify the active range by its cell reference displayed in the Name Box, typically located to the left of the formula bar. Additionally, any actions or functions you apply will affect only the active range. If you see a blinking cursor in the first cell of the selected range, that's another indication that the range is active.
Yes you can.
active cell
At any moment in time, at least one cell has to be selected in Excel. It is known as the active cell. There has to be a focal point so that data or formulas can be typed in. Even when more than one cell is selected, there is only one active cell. Which cell is the active cell can be changed at any time, but there always has to be an active cell. If there isn't then, before you do anything, you would have to make a cell active. Cells are fundamental to Excel so there has to be an active cell at all times.
At any one time you can only be working on one cell in Excel, like when you are typing data. Even if you have many cells selected, only one can actually be used. That cell is the active cell. All other cells are inactive. So an inactive cell is any cell that is not the active cell.
cell contents
If you select one cell, it will be active. However, if you select multiple cells at once, only one can be the active cell. That is usually the cell you select first.
To format a cell in excel right click on it, then on the thing that pops up click on format cell