Crafting:
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Starter: Quill Pen, plate, common rings, clay and sand collection *
Easy: Bottle, Melting iron, redware candles, Expensive rings
Moderate: basket, flasks, apprentice alchemy apparatus,elegant rings
Hard: Hamper basket, lamps, silver candlesticks, limeware, extravagant rings
Tough: higher alchemical apparatus, higher picks and probes, exquisite rings
Special: All 'grandmaster' level items


Cooking:
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Starter: Steamed crab, fried durzog
Easy: Hound, rat, slaughterfish, rice/wheat/rye flour
Moderate: Breads, kanet butter, sugar, starch, fiber, cookies
Hard: Sweetbread, scuttle soup, pies
Tough: Fancy seafood dishes, felaril, brewing liquors
Special: Brewing Cyrodiilic brandy & flin


Fletching:
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Starter: Corkbulb arrows/bolts
Easy: Chitin, iron arrows and bolts, Huntsman's bolts
Moderate: Steel, bonemold missiles
Hard: silver, orcish, glass
Tough: Ebony arrows and bolts
Special: Ebony darts, spring darts


Sewing:
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Starter: Cloth sack, pillows
Easy: Common clothing, cushions, weave cloth
Moderate: Expensive clothing, weave rugs
Hard: Extravagant clothing
Tough: Exquisite clothing
Special: Exquisite tapestries


Poisons:
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You'll have to find out for yourself... but they're not easy!


Pottery: **
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Starter: Redware cups, redware plates
Easy: Clay goblets, basic bowls, crucible
Moderate: Empty liquor flasks, redware pitchers
Hard: Brandy bottles, blue pitcher
Tough: Urns


Woodworking:
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Starter: Decorative plaques, wooden spoons, brooms
Easy: Cheap shelves, benches, scrapwood tables, stools
Moderate: Worktable, lecturn, hammock, barrel
Hard: Simple beds, expensive shelving, bookshelves, kegstands
Tough: Extravagant beds, wineracks, pottery wheel


Smithing:
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Starter: Smelting iron, smelting silver ***
Easy: Netch leather armor, fur armor, chitin
Moderate: Iron weapons & armor, steel weapons & armor
Hard: Nordic Bear armor, wolf armor, Templar armor
Tough: Dark Brotherhood armor, bonemold, orcish, Nordic silver
Special: Adamantium, glass, ebony & Daedric items


Mining:*
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Starter: Iron ore, silver ore
Easy: Diamonds, glass, ebony
Moderate: Adamantium

* Each successful collection increases the difficulty of the next attempt.

** Pottery is a subset of "Crafting" skill

*** Smithing can be trained by smelting iron or silver ore only to level 25 and 30 respectively. Additional smelting beyond those levels does not result in training.