To select adjacent columns, click the first column header and drag across the other column headers
To select adjacent columns, click the first column header, hold Shift, and click the last column header
To select non-adjacent columns, click the first column header, hold Ctrl, and click each additional column header
To select all columns in a worksheet, click the Select All button at the top-left corner of the sheet
To select multiple columns using the Name Box, type a range such as A:C or A:A,C:C and press Enter
To select multiple columns with the keyboard, click a column header and use Shift plus arrow keys to extend the selection
To deselect a column from a multi-selection, click another column while holding Ctrl
To select entire columns from cells, click a cell in the column and use Ctrl plus Space, then repeat with Ctrl held for additional columns