Select the cube

1.

Detail steps

Press S key to scale the cube

1.

Press Z key to scale the cube along with Z axis

2.

Detail steps

Select the ground

1.

Press S key to scale the cube to be bigger

2.

Detail steps

Select the ground

1.

2.

Detail steps

3.

Press S key to scale the cube

Press Z key to scale the cube along with Z axis

Press Ctrl + B to use Bevel tool

1.

2.

Detail steps

Press Tab key to edit the cube

4.

Scroll the mouse to add more lines

5.

Click to confirm

Press Ctrl + B to use Bevel tool

1.

2.

Detail steps

Press Tab key to edit the cube

3.

Move the mouse to adjust corners of the object

6.

Press Tab key to leave the edit mode

Press Ctrl + B to use Bevel tool

1.

2.

Detail steps

Press Tab key to edit the cube

3.

Move the mouse to adjust corners of the object

Detail steps

Change viewport shading to show colours and lighting

1.

Detail steps

Select default light bulb or create a new light bulb by pressing Shift + A key.

1.

Press Shift + D keys to duplicate more light bulbs 

2.

Detail steps

Press Shift + A keys to pop the menu

1.

Choose Mesh -> Cylinder

2.

Detail steps

Select the cylinder

1.

Press G key to grab the object

2.

Press Z key to move it along with Z asix

3.

Detail steps

Select the cylinder

1.

Press Tab key to edit the object

2.

Detail steps

Press Ctrl + B keys to use Bevel tool

1.

Move the mouse to adjust the corner of the object

2.

Click to confirm

3.

Detail steps

Press Tab keys to leave the editing mode

1.

Detail steps

Press R key to rotate the object

1.

Click to confirm the rotation

2.

Detail steps

Press G keys to grab and move it to a suitable place

1.

Click to confirm the movement

2.

Detail steps

Press Shift + A keys to pop up the menu

1.

Choose Mesh -> Cube

2.

Detail steps

Select the cube

1.

Press G key to grab the object

2.

Press Z key to move it along with Z asix

3.

Detail steps

Select the cube

1.

Press S key to scale the object to be smaller

2.

Detail steps

Select the cube

1.

Press Tab key to edit the object

2.

Detail steps

Change to the face mode to enable selecting faces of the object

1.

Detail steps

Select the face

1.

Press E key to extrude the face

2.

Press S key to scale the extruded face

3.

Detail steps

1.

Press E key to extrude the face

Detail steps

1.

Press E key to extrude the face

2.

Press S key to scale the extruded face

Detail steps

1.

Press E key to extrude the face

Detail steps

1.

Press A key to select all faces of the object

2.

Press Ctrl + B key to use bevel tool

Detail steps

1.

Press Tab key to leave the edit mode

Detail steps

Press Shift + A keys to pop up the menu

1.

Choose Mesh -> UV Sphere

2.

Detail steps

Press Tab key to edit the object

1.

Press and hold Shift key to select top faces

2.

Detail steps

Press E key to extrude the face

1.

Press Z key to move it along with Z asix

2.

Detail steps

Press S key to scale the face

1.

Press Z key to move it along with Z asix

2.

Input 0 as the scaling size

3.

Detail steps

Press E key to extrude the face

1.

Press S key to scale the extruded face

2.

Detail steps

Press E key to extrude the face

1.

Detail steps

Press E key to extrude the face

1.

Press S key to scale the face

1.

Detail steps

Press E key to extrude the face

1.

Detail steps

Press Tab key to leave the edit mode

1.

Press S key to scale the object

2.

Press Z key to scale it along with Z asix

3.

Detail steps

Press Tab key to edit the object

1.

Press and hold Shift key to select faces

2.

Detail steps

Press E key to extrude the face

1.

Press S key to scale the selected face

3.

Pull up and click to confirm

2.

Input 0 as the scaling size

4.

Detail steps

Press Tab key to leave the edit mode

1.

Press R key to rotate the object

2.

Detail steps

Right click the object

1.

Select Shade Smooth option to make faces to be smooth

2.