Depending on what you are selling, your first step is to get a local selling account on sites like Craigslist, Facebook, or Nextdoor for example. Make sure not to give away your personal information. After your account is set up, start selling your items. This may include giving a good description and photos. Make sure your photos are clear and disclose all features (tags, dings, et). If you live in a large neighborhood, they typically have a Facebook Marketplace group specific to your neighborhood. Many neighbors sell via porch pick up (ppu) where you can leave items for sale on your porch and get paid using Venmo. If you have larger items to sell, many buyers and sellers meet at local public places and bring a friend or loved one with them to be safe. Always listen to your gut if you are not comfortable with a sale. And watch for pay ahead scams for things like puppies and antiques.