Circle Hook or not?

[dsafety]

A recent thread got me thinking. I have no idea when to use a circle hook and when to use a regular one. For that matter, what about a ring hook or a plain one? Then there is the question about hook size. I know that you are supposed to size the hook to the bait but some people go large and some go small.

If anyone cares to pass on some basic hook knowledge, I would sure appreciate the education.

Bob