What range of fishing rod casting weight?

What range of a fishing rod casting weight do I need for general medium sized sea/shore fishing? I’m unsure as to what casting size I need in my fishing road and in the reel line?

thanks for any help!
There is a certain weight a fishing rod can strain too before it breaks, does anyone what what casting size I would need to catch standard averaged size sea fish?

Also what line weight between (3-18lbs) would be good for catching sea fish?

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