Try to be the best of what you are even if what
you are is no good.

Concept 3.2c : Drawing a LineStrip in 3D Space
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Idea:
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OpenGL allows us to draw a line strip ( a 
continuous line) by using GL_LINE_STRIP as the 
argument to glBegin().

If the vertices are specified as Vo, V1, ...
Vn-1 then GL_LINE_STRIP draws a line strip as 
follows:
A line segment from Vo to V1, then from
V1 to V2 and so on, finally drawing the segment 
from Vn-2 to Vn-1.  Thus a total of n-1 segments
are drawn.  Nothing is drawn unless n is larger
than 1 i.e. at the very minimum you must provide
the coordinates of atleast two vertices.

Exercise:
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Can you draw the house from the previous example
using line strips ?