Spiders have eight legs, 4 pairs. Most spiders have 6-8 simple eyes in various arrangements. All spiders have a pair of jaw-like structures, the chelicerae, each of which ends in a hollow fang through which venom can be injected. It has 2 body regions: a cephalothorax (fused head and thorax) and an abdomen, which are joined by a narrow waist.
Some like damp place such as basements. CrawlSpaces & other damp parts of the building. Others like dry warm areas such as subfloor air vents, upper corners of rooms & attics. They will hide in dark areas.
Spiders are predators & feed on living prey, mostly other insets. They produce a venom that is poisonous to their normal prey of insects, mites, and other anthropoids.
Spiders produce egg sauce which is laid either in a web, attached to a surface or carried within the female. Spiders may produce several egg sacs, containing several hundred eggs. A spider grows by molting or shedding its skin, usually 4 - 12 times before reaching maturity.
Only 2 species of spiders that are dangerous to humans, the brown recluse spider B the black widow.