Move rows or columns

I know it’s a dumb question, but I can’t find the answer in the help facility:

How do you move a row (or rows) up or down a spreadsheet? Or move columns across?

Thanks in advance,
Oliver

See an example in this question, How to drag an existing cell, or cells, to new location in Calc - #2 by EarnestAl

Select
Moving Cells by Drag-and-Drop