Should ghee be kept out of light

Dried herbs really do only last around six months, certainly no longer than a year. They're generally easy to get in small quantities, though.

Spices are trickier. They'll generally last rather longer, but the time will vary. If the spice is used for the colour and/or heat (e.g. turmeric, chilli) it will generally last much, much longer than one used for its smell and/or taste. Whole spices last much, much longer than pre-ground; I generally buy whole spices from asian stores, they sell them in much larger amounts for the same prices as supermarkets; and use a coffee mill to grind the right amount just before cooking (and keep a separate one for coffee!).

If kept in the dark, in a dry, clean, airtight glass container, spices and dried herbs will certainly not become health hazards, and should not pick up unpleasant tastes or odours. The strong-tasting / strong-smelling ones will, however, lose taste and smell, eventually almost completely; since that is the whole point of using them, you might as well not bother once they're off.

Storing brown sugar in a tightly sealed container (such as tupperware, rubbermaid, etc.) is the best method.

Once it dries out however it can be re-moisturized by placing a piece of apple or bread with it inside a tightly sealed container. After a day or two the brown sugar will soften and the bread will dry up or the apple will shrivel.

This is due to the hygroscopic nature(ability to absorb moisture from the surrounding atmosphere)of brown sugar.

You'll see "brown sugar keepers" in gourmet and cookware shops that are round decorative unglazed ceramic or terra cotta disks. The concept is to soak them in water for an hour or two and then dry and place in the brown sugar. Save your money and use a piece of bread or apple when the brown sugar is drying up.

You can also soften it for immediate use by microwaving for a little bit. This should only be used for immediate use because after the sugar cools it will have lost more moisture (due to the fact that microwaves are heating the moisture in food).