I am following a youtube tutorial, but the cloth simulation doesn't work as desire. May I know what the problem is? I have not idea what is going wrong
Yes. The Blender cloth simulator will not work if you only have a simple un-subdivided mesh. If you go to edit-mode, and set the subdivision setting to around 50 subdivisions, then the simulation should work well. Setting the step quality of the cloth simulator to about 7 yields a fast simulation, while not using up too much RAM.