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FYI I am very new to Blender.
I need to: Create a cylinder with a cavity - just like a cup.
What did I try:
The problem: the "Subdivision modifier" creates a very weird result (see images).
Two questions:
The subdivision modifier does not work well with n-gons (faces with more than four vertices). In fact, you should if possible only use quads (faces with four vertices/edges).
After your operation there are four ngons (the fourth is on the bottom of the cylinder).
Delete the ngons. X
To fill the gap between the outer and inner wall at the top, use the Bridge Edge Loops operation from the Edge Menu. CtrlE
For the circular shape it is enough to add a supporting edge loop before merging AltM the vertices at the center. The resulting triangle should only be on planar surface and surrounded by the supporting edge loops.
You can also fill such holes with quads using the Grid Fill operation, though it may be overkill in this situation where your surface is planar.
No need to use Subdiv modifier which gives you more details but not necessarily smooth shading (unless you have high enough subdivision which is overkill).
How about starting from a cylinder, inset, extrude down, shade smooth and auto-smooth?
