To add columns in Excel, you can follow these simple steps:
1. **Open Excel**: Open the Excel spreadsheet where you want to add columns.
2. **Select Columns**: Click on the letter of the column to the right of where you want to add a new column. For example, if you want to add a column between columns B and C, click on column C.
3. **Insert Columns**: Right-click on the selected column letter (or press the "Ctrl" key on your keyboard and then press the "+" key) and select "Insert" from the context menu that appears.
4. **Verify Insertion**: You'll notice that a new column has been inserted to the left of the column you initially selected. The existing columns will be shifted to the right, and the newly inserted column will be empty.
Alternatively, you can also use the Excel ribbon to insert columns:
1. Select the column or columns to the right of where you want to add new columns.
2. Go to the "Home" tab on the Excel ribbon.
3. In the "Cells" group, click on the "Insert" drop-down arrow.
4. Select "Insert Sheet Columns" from the dropdown menu.
This will also insert a new column or columns to the left of the selected columns.