I am new to Blender.
According to my toturial, I have to create an abject like a flat.
He hit F and the object changes, but when I hit F in my object, it does not change
I am using the blender 2.81
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The reason this happens is because you have 'subsurface' modifier enabled. What subsurface modifier does is basically adds extra geometry to your mesh.
In your case, the type is set to Catmull-Clark which in short will basically smooth out your mesh.
So if you start with a basic cube
Now an easy way to make the object look like what you want it to be is add extra vertices where you want the detail. So if I were to add some extra vertices at the corners of the cube it will start to resemble the cube again
Now if you understood this you would have guessed you need to add extra geometry in your mesh at the top of your coffee(or water? depends on how far you are in that tutorial)