Deer hair is used to make several kinds of flies - streamers, bass bugs and some dry flies. It is slippery stuff and will want to spin around the shank of the hook as you tie it on. Covering the hook with thread before applying the deer hair will help, but you may want to build your thread handling skills before you tackle deer hair flies. Dubbing is spinning animal fur on thread to make fly bodies. The thread is heavily waxed, then small amounts of fur are pinched on the thread and spun between the thumb and finger.
Most tiers make the mistake of trying to apply too much fur to the thread at one time.
One of the pleasures of fly tying is gathering a collection of materials, everything from feathers, fur and hides to new synthetics. Searching through the catalogs and fly shops for a certain type and size of feathers, or just that particular shade of fur you need, is as much fun as hunting for collectibles, but cheaper. My collection includes some strange items - ostrich herl and Australian opossum fur. I collected myself with a gun, and I have grouse wings, duck feathers and turkey feathers that other hunters have given me. I've bought, or collected, over the years, three kinds of deer hair, plus elk hair and deer tails.