There are several methods to delete one or more lines.
DL stands for delete lines.
After you have pressed the return key, any line you have marked in this way is deleted. You can write the label d wherever you like in the number area. You can apply this method to delete several lines in a row. This deletes the marked line and the following one. If you type the character d at the beginning of the number, you have to use a space after the specification of the number of lines to delete.