Eeeek, are spiders dangerous to humans???

Why are most spiders not only not harmful, but actually helpful to people? What is the super gross way spiders eat their prey? What are spider webs made out of? For free home activities sign-up at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.