For beginners, mastering primitive 3D models starts with learning basic shapes (cubes, spheres), then modifying them with tools like extrusion or scaling, and combining them to make simple objects.
First, get comfortable with core primitives (3D modeling’s "building blocks"). Use transformation tools (move, rotate, scale) to adjust size and position. Add detail with edits (like extruding faces) or modifiers (like bevel). Combine primitives using booleans (union/subtract) for complex shapes. Practice with small projects (e.g., a chair from a cube and cylinder).
Try a free tool like Blender and recreate everyday items (mug, book) using only primitives—this builds muscle memory and reinforces basics without overwhelming you.