The native "Push/Pull" tool in SketchUp is limited to extruding flat faces along a single axis. The Joint Push Pull plugin expands this functionality, allowing users to extrude faces along their normal vectors (Vector Push Pull), thicken surfaces (Joint Push Pull), or project them.
Begin with basic shapes and gradually move on to more complex models. This approach will help you get a feel for how the tool works. sketchup joint push pull crack