To learn 3D polygonal modeling without experience, start with free beginner-friendly software (e.g., Blender) and master basic tools (extrude, loop cut) via step-by-step tutorials.
Polygonal modeling uses vertices, edges, and faces to build shapes—practice simple objects (cubes, spheres) first to get comfortable manipulating these core elements. Follow beginner-focused guides like Blender Guru’s "Donut Tutorial," which applies skills to real workflows by creating common items.
Once basic shapes feel easy, replicate small real-world objects (a mug, a book) to refine precision—starting small avoids overwhelm and builds confidence steadily.