If you mean from one table column to the next, use the Tab key.
If you mean newspaper columns and there already is text in all columns,
click in the column where you want to edit.
If you mean newspaper columns, then text will automatically wrap to the next
column when you reach the bottom of the page (or the bottom of the section
if there's a continuous section break before the bottom of the page). If you
want it to wrap sooner, then press Ctrl+Shift+Enter,