The phrase refers to a high-level training series called CORE Fundamentals , released by the educational platform CG Cookie for Blender 4.2 .

Based on the filename provided, this appears to be an archived course (likely split into parts, given the .004 extension) from CGCookie regarding Blender 2.8x–3.x "Core Essentials."

Elias reached for his mouse. As the cursor crossed the threshold into the viewport, the cursor vanished. He wasn't moving a digital arrow anymore; he felt a weight in his hand—a grease pencil, heavy and warm.