The document discusses building a modern digital analytics stack. It recommends starting with measurement and collecting data, which can be done using tools like Google Analytics, marketing platforms, and server-side containers. Over time, the stack has grown to include more data sources, tools for data transformation, and BI tools for data visualization. Setting up the stack does not need to be expensive, as many tools have free or low-cost options. The key is to start collecting data and then refine the stack over time based on learnings.