Shift + Delete

One of the most useful shortcuts that I use frequently is the Shift + Delete to delete a line.Often as a programmer I found it really annoying to delete the lines using either Backspace or Delete iteself, sometimes just to clear out the commented code or to clear out the extra lines in a program.
Shift + Delete allows to delete a line,empty line and with the up,down arrow keys it can be used to delete multiple lines.
Another useful shortcut used to delete an entire word is Shift + Control + Delete in combination with the arrow keys.