The table content block has two variants, one with a headline and text intro, and one without. Both have header rows that should be used to label the type of information in the row.
It's important to note that the table content block has been intentionally limited to two columns. More columns would cause a space issue, especially on mobile. Don't try to squeeze in more columns than the two already there. You can, however, add more rows by right clicking a row in the content editor, mouse over "row," and delete a row or add a row before or after the row you selected.