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Taking the standard opengl 4.0+ functions & specifications into consideration; i’ve seen that geometries and shapes can be created in either two ways:
making use of VAO & VBO s.
using shader programs.
which one is the standard way of creating shapes?? are they consistent with each other? or they are two different ways for creating geometry and shapes?
Geometry is loaded into the GPU with VAO & VBO.
Geometry shaders produce new geometry based on uploaded. Use them to make special effects like particles, shadows(Shadow Volumes) in more efficient way.
tessellation shaders serve to subdivide geometry for some effects like displacement mapping.
I strongly (like really strongly) recommend you reading this http://fgiesen.wordpress.com/2011/07/09/a-trip-through-the-graphics-pipeline-2011-index/