I have a UV sphere that I want to compress into an oblong shape. So, I will start compressing it at the UV sphere's top vertex, the bullseye looking vertex. In tutorials, you press G to transform or change its shape. Mine only moves the object while grabbing it and doesn't change shape.
As you can see in the image above, I tried compressing it by pressing G at the top vertex. Instead, it passes through my table model, sinking and phasing through rather than being compressed.
I only started today and have about 10 hours spent.