The Build Interface in the Coalesce UI is where you'll spend most of your time working with Coalesce. This is where you will build your transformational data pipelines by creating and joining nodes, applying transformations, and organizing your work via Subgraphs and Jobs.
This interface is accessed within the browser-based Coalesce UI via the Build icon (pictured below), which is situated at the top-center of the Coalesce UI window.
The Overview of the Build Interface section of the Coalesce documentation provides a visual overview of the Build Interface and its various components, and the Introductory Demo offers a live-action glimpse into working with it.