If you want the columns to have a label, the term you are looking for is 'categories', which does make sense, just not the way i was thinking about it, usually 'x-axis, y-axis or something like that in my head'
To give your columns names, select the little funnel looking icon, go to 'horizontal (category) axis labels' select 'edit', then select the names you want each column to have from your spreadsheet and the fields will populate as you expect.
just another note for my own personal FYI.
