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I am watching Blender Guru's tutorial on how to make a donut and he is making a cup of coffee but for whatever reason whenever he does CTRL R to fix the hole in the middle of the liquid it works for him but I have tried it many times and it doesn't do anything. Please help me.

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I don’t think there is a hole - it looks to be refraction showing the inside of the cup. Try reducing the IOR of your shader and see if the problem goes away - that will show whether there actually is a hole. Also, check your normals as that is critical with refractive surfaces since flipped normals will also flip the refraction properties. Also check that you have a realistic IOR for the material being modelled (eg, typically in the range 1.0 for air to around 1.33).

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    $\begingroup$ There's definitely no hole, I agree with you. And I'm just watching the tutorial right now, of course Andrew is not using Ctrl+R to close a hole, he creates a loop cut to make the top edge sharper... $\endgroup$
    – Gordon Brinkmann
    Commented May 29, 2021 at 9:43
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    $\begingroup$ I’ve not seen the tutorial and couldn’t remember what Ctrl R did but thanks for the reminder and clarification :-) $\endgroup$
    – Rich Sedman
    Commented May 29, 2021 at 10:11
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how to get rid of holes:

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1: fill: Select hole and press F to fill - OR press ctrl+F and select fill OR go to face > fill enter image description here enter image description here

2: Grid fill: Select hole and press ctrl+F and select grid fill OR go to face > grid fill enter image description here

3: merge: Select hole and press M and merge at center OR mesh > merge > at center: enter image description here

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    $\begingroup$ +1, though I think Rich Sedman is right and there's no hole in topology. $\endgroup$
    – Markus von Broady
    Commented May 29, 2021 at 9:26

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