The software to learn for interior design first is AutoCAD. AutoCAD is widely used in the industry due to its versatility and the ability to create detailed 2D and 3D designs. According to a survey by the American Society of Interior Designers (ASID), 94% of interior designers use AutoCAD in their professional practice. This popularity is due to its robust features, such as accurate drafting, rendering capabilities, and integration with other design software. Learning AutoCAD first provides a strong foundation in technical drawing and spatial planning, which are essential skills for interior designers.