ctrl+f - move one character forward
ctrl+v - move one character backwards
ctrl+n - next line
ctrl+p - previous line
ctrl+k - delete to the end of the line
ctrl+d - delete the next character
ctrl+h - delete the previous character (backspace)
ctrl+o - insert a newline below the current
Using the ctrl key takes some getting used to if you've used a Mac for a long time (I mapped mine to caps lock in the system preferences) but once you learn these keys they are incredibly useful.