Knife holders are typically referred to as sheaths rather than holsters. A sheath is a protective covering or pouch designed to hold a knife securely, usually made of materials like leather, nylon, or Kydex. Holsters, on the other hand, are specifically used for firearms, not knives.
That is correct.
All knives will dull overtime if not properly cared for.
of Knife, of Knife. See Knife.
The irregular plural form for the noun knife is knives.
The plural of knife is knives.The plural possessive is knives', as in the knives' handles were muddy.
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A good Chef will have a range of knives to help prepare different foods, here is a common selection, Chefs Knife, Boning knife, fish filleting knives, paring knife, peeling knife, butchers knife, Bread knife, carving knife and meat clever. Japanese kitchen knives tend to be a lot more specialized and diverse. The list of over 100 knife types in the attached link.
I have used the Work Sharp Knife and Tool Sharpener for all kinds of knives.