In World of Warcraft, Darnassus is the capital of the Dark Elves, and there are no stores to buy skinning knives there, nor will there be a place to learn how to fish.

In general, skinning knives are tools used by hunters, thieves, and other professions to skin animals, and are not usually sold in cities or stores. Fishing, on the other hand, is a life skill that usually requires players to reach a certain level and find the appropriate trainer to learn it.

So if you can't find a place to buy a skinning knife or learn to fish in Darnassus, you may want to consider looking in other cities or regions or trading with other players in the game to obtain one.