If describing 3D shapes in kindergarteners in accordance with textbooks, in general, can certainly make it difficult for children to understand them because 3D shapes are still very new to learn even though they already know the shape of the objects around them. You can give a simple explanation in the form of an object that has length, width and also space in it because there will be a weight in the 3D shapes.
There are many 3D shapes that continue to evolve with the advancement of time and also the needs of everyone. You can give the simplest 3D shapes examples for kindergarteners. This is because children still need a very long process to process something new for them. You can start with Cylinder, Square, Cube and Cone. These four 3d shapes are shapes that are familiar with objects owned by children. After you are able to master the four shapes, you can teach them triangles and other shapes which are branching or fraction parts of all four 3D shapes.
Conducting activities for kindergartener must have a strategy so as not to be dominated by having fun of playing but also to learn. In the 3D shapes lesson, there are interesting activities you can do for them. First, explain the definitions of some of the 3D shapes that you teach. After that ask the children to make a list of objects around them that have the same shape as the 3D shapes that you teach. The more lists you have, the more values your child will get. This activity will be challenging for children. The sensitivity of his eyesight and also the skills to socialize asking people around him will be trained by doing this activity.
Lesson learning does take time to be able to be conveyed well by children. But don't be too fixated on the existing textbook. You can teach 2D or 3D shapes simultaneously or one of it first. Because this requires eye sensitivity to analyze, so the 2D shapes and 3D shapes lessons can be done flexibly. It would be better for you to teach 3D shapes first because later it will be easier to explain the 2D version of each shape.