Ex: Create a Vase

Create the Shape of Vase

Create 3 circles: 10, 15, 25

Use gizmo move the circles in Z direction:
Smallest circle: 150
Biggest circle: 100

Home tab > Modeling panel > Loft

Select the circles in sequence, from bottom to top

Press Enter

Select Settings on the list

Draft angles
Start angle: 120
End angles: 120
As you input the settings, you can preview the the shape in the drawing

Click OK

Create a Shell

Home tab > Solid Editing panel > Shell

Select the vase

Click on the top face to remove

Command Line show:

1 face found, 1 removed

Press Enter

Input 1 for the shell offset distance

Press Enter, Enter to exit