This level builds on the foundational concepts by testing a user's practical knowledge of core n8n nodes, data flow principles, and fundamental flow control logic. Proficiency at this level demonstrates the ability to construct a functional and reliable workflow. The questions in this section delve into the specific functions of key nodes, the use of expressions and variables, and how to manage the flow of data.

The HTTP Request node is a central component for any advanced workflow, acting as a versatile tool for interacting with virtually any REST API.5 Unlike a pre-built integration node, which offers a limited set of actions, the

HTTP Request node provides the flexibility to perform any type of API call (GET, POST, PUT, DELETE) by manually configuring headers, authentication, and request bodies.6 This requires a deeper understanding of API terminology and concepts. The

Set node is equally foundational, serving as the primary tool for data preparation and restructuring within a workflow.5 It allows a user to add new fields, transform existing data, and ensure consistency across different parts of the workflow. The

If node, a cornerstone of flow control, enables the creation of different execution paths based on specific criteria, a crucial step in building intelligent, data-driven automations.5

A central principle of n8n is that data flows from the output of one node to the input of the next.6 This is facilitated by the use of dynamic expressions, such as

{{ $json.field }}, which are critical for passing data between nodes and creating personalized or contextually relevant messages.4 A fundamental conceptual point for a developer is the trade-off between the ultimate flexibility of a generic node like

HTTP Request and the ease of use of a pre-built integration node (e.g., Google Sheets or OpenAI).23 While the latter simplifies configuration and reduces the need for manual API research, its functionality is limited to the supported actions. This highlights a core design principle in low-code platforms: balancing powerful, generic tools with convenient, purpose-built integrations. Security is also a major consideration, which n8n addresses through a dedicated credential management system, ensuring sensitive API keys are not hardcoded but can be securely reused across multiple workflows.