Only two of the species, the brown recluse and the black widow, are dangerous to humans. Spiders are remarkably useful. They eat flies, moths, cockroaches, and a host of other insects. Each day, spiders on the earth consume a combined volume of insects that exceeds the combined weight of all the people on earth. In China, farmers build little straw teepees in their fields to house hibernating spiders so that the eight-legged helpers will stay around to keep insects from destroying crops.
Spiders are shy and non-aggressive, and prefer to be left alone.
Don't bother them, and they'll leave you alone.