Tips on playing against Certain Champs pls

How do I play against Mid lane Urgot in lane and in the mid game Mid lane Swain in lane and mid to late game Diana in any role AS the mid laner. Do I just roll over and cry if she gets fed? Top lane Nasus AS the mid laner from mid to late game Top lane Riven AS the mid laner. Do I just do same thing as I would with a fed Diana if Riven gets fed? Tips and counterpicks/strong champion matchups would be incredibly well appreciated! I'll pray for all your souls!
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