Selecting (Highlighting) Cells, Columns, Rows, or Spreadsheets
Click Cell A1, it is outlined in black.
Drag mouse up, down, left and right to select multiple rows or columns.
Hold SHIFT and ARROW keys at the same time to select multiple rows or columns.
Click on the top of Column A to select the entire column.
Click on Row 1 to select the entire row.
Click the upper-left corner to select the worksheet
Note that the selected area is outlined in black.