Tinkercad is a basic 3D design program that is good for beginners and creating simple objects but may not be suitable for complex designs. Objects printed with Tinkercad require supports for any overhanging parts and work best with geometric shapes that have large flat surfaces. The document provides instructions for creating an account, importing designs, modifying objects by dragging and dropping shapes, scaling, grouping objects, exporting files, and sending prints to be fabricated.