Building a powerful software application like Nextdoor without coding can be achieved using Bubble, a visual programming tool that makes it easy to design and program beautiful, dynamic products. To get started, users need to register for a free Bubble account and complete introductory lessons to familiarize themselves with the platform's features. The process involves wireframing the product design, creating database fields, and building workflows to stitch everything together. Workflows are triggered by events, such as button clicks, and can be used to update user profiles, create posts, display dynamic content in a feed, and send data between pages. With Bubble, users can build a Nextdoor clone or any other product without coding, using templates, plugins, and the community forum for support and resources.