Learn what 3D means - 3D shapes are solid shapes which have length, width and height (or depth)
Learn common 3D shape names:
Learn more complex names - octahedron, dodecahedron and icosahedron (these are also called platonic solids and this group of shapes also includes the cube and the tetrahedron)
Learn about properties of shapes - edges - faces (number of faces as well as the shape of faces) - vertices (plural of vertex)
Learn what prisms are - 3d shapes which have a pair of parallel congruent faces and anywhere you make a cut between these faces which is parallel to the faces, will give you an identical cross section)
Identify nets for the shapes (use polydron)
Make nets