Deleting Objects : Click on Select Object Tool and then click on any Object to select it, press Delete button on Keyboard or Edit Menu > Delete

Selected Object will be deleted.

Creating Box

1. Create Panel > Geometry > Standard Primitives > Click on Box button
2. A Box has three parameters - Length, Width and Height (or depth). Bring mouse in Top Viewport, press mouse button on one end and drag upto second end to define Width and Length of Box, release mouse button. Now move mouse Up to define Height of the Box and click mouse button at suitable height. Height of the Box will be Visible in other three viewports.

Creating Cylinder

1. Create Panel > Geometry > Standard Primitives > Click on Cylinder button
2. Bring mouse in Top Viewport, press mouse button and drag to define radius of Cylinder, release mouse button. Now move mouse Up to define Height of the Cylinder and click mouse button at suitable height. Height of the Cylinder will be Visible in other three viewports.

Creating Torus

1. Create Panel > Geometry > Standard Primitives > Click on Torus button
2. Bring mouse in Top Viewport, press mouse button and drag to define radius of Torus, release mouse button. Now move mouse outside or inside to define radius of the Cross Section of Torus and click mouse button at suitable size.

Creating Cone

1. Create Panel > Geometry > Standard Primitives > Click on Cone button
2. Bring mouse in Top Viewport, press mouse button and drag to define radius of Cone, release mouse button.
3. Now move mouse Up to define Height of the Cone and click mouse button at suitable height.
4. Now move mouse Up or Down to give desired shape to the Cone and click mouse button.

Creating GeoSphere

1. Geospheres produce a more regular surface than standard spheres. Geosphere uses triangle faces instead of square faces and created using fewer polygon faces than the standard Sphere object. They also render with a slightly smoother profile than a standard sphere given the same number of faces.
2. Create Panel > Geometry > Standard Primitives > Click on GeoSphere button
3. Bring mouse in any Viewport, press mouse button and drag to make GeoSphere of desired size, release mouse button.

Creating Tube

1. Tube is similar to the cylinder with a hole in it.
2. Create Panel > Geometry > Standard Primitives > Click on Tube button
3. Bring mouse in Top Viewport, press mouse button and drag to define the first radius of the tube, release mouse button.
4. Now move mouse to define the second radius, then click mouse button.
5. Move mouse up or down to define a height, either positive or negative - and click mouse button.

Creating Pyramid

1. Create Panel > Geometry > Standard Primitives > Click on Pyramid button
2. Bring mouse in Top Viewport, press mouse button and drag to define the base of the pyramid, release mouse button. Now move mouse Up to define Height of the pyramid and click mouse button at suitable height. Height of the pyramid will be Visible in other three viewports.