I forgot to mention these are also critical to know, because they apply to pretty much everywhere in OSX (even inside chrome address bar, terminal, plain text areas like the HN reply box, etc):

c-f Move forward

c-b Move backward

c-p Move up

c-n Move down

c-a Jump to beginning of line

c-e Jump to end of line

c-d Delete forward

c-h Delete backward

c-k Delete forward to end of line

c-u Delete entire line