Using a fictitious but realistic example, we will discuss various diagrams to capture important solution approaches and decisions. In addition to the four views (system context, building block view, runtime view, and distribution view), this also includes other visualizations such as a big picture or a quality tree. We discuss what content belongs in the respective diagram and which form and style guidelines should be adhered to. We will use freely available tools and lightweight methods such as Diagrams-as-Code, Documentation-as-Code, C4, arc42, docToolchain, kroki.io, PlantUML, Structurizr, draw.io/diagrams.net. You can apply what you have learned directly to your projects and will be able to provide your colleagues with easy-to-understand and easy-to-maintain software architecture diagrams in the future.