Answer:
When I type I tap these on the keys
What can you hold in your left hand but can never hold in your right hand?
What falls down but never gets hurt?
What travels from coast to coast without ever moving?
What has black spots and a white face, is fat not thin, and helps you to win, but tumbles all over the place?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.