I am new to Civi and am trying to create reports for a fundraising department. How do you add email (or other columns/fields) to the standard contribution reports.
Look in the Columns tab to see what fields are available for that specific report. If the field you want is there, then just tick the box to include it in the report. However, if the field is not listed then code changes are needed to include it.
Some reports show overlapping sets of information so if the report you are looking at does not contain the field you need, it is worth looking at other reports to see if they can be configured to provide the results you want.
If you are using Drupal then Views provides a lot of flexibility for producing alternatives to Reports.