Can someone give me a quick primer on drill bits? All I think I know is that
high speed steel is the worst. Carbide tips are good. Where do cobalt and black
oxide fit into the mix? My interest in is "standard" drill bits for thin metals
and wood rather than masonry.

My Craftsmen sets are showing their age and wear. Where is a good place to buy
drill bits? Should I look at an industrial supplier rather than a retailer?