You can organize information in tables in a rich text TextEdit document.
Place the insertion point where you want to add the table.
Choose Format > Table.
In the Table window, type the number of rows and columns you want (or click the arrow buttons to add or subtract rows and columns).
To adjust the height of a row or the width of a column, place the pointer over a cell border. When the pointer changes to a double-headed arrow, drag the border.