In Notepad++, I can use Ctrl + Shift + Up / Down to move the current line up and down. Is there a similar command to this in Vim?
In command mode position the cursor on the line you want to move down, and then
ddp
Explanation: dd deletes the current line to the general buffer p puts it back AFTER the cursor position, or in case of entire lines, one line below.
There is some confusion regarding commands p and P in many docs. In reality p pastes AFTER cursor, and P AT cursor.