Help With SubDivision Surface

I’m in blender attempting to make a ghost that somewhat looks like a pac man ghost.
Tutorial I’m using: Modeling and texturing a Pacman Ghost - Blender 2.8 Tutorial - YouTube
When I add a subdivision modifier to a cylinder it looks like this


I added some loop cuts but the bottom looks like this

How can I fix this and why doesn’t the person in the tutorial have problems with the subdivision surface mod? Thanks

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Subdivision works best with spheres, cylinders are different. You can also subdivide by using control 3, 4, 5, etc.

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