pumping lemma for CFL

sorry for amateur question but...
can someone give links to info that helps one capture/grasp the pumping
lemma for CFL ? i am missing something, some basic **important** aspect
that preventing me from going from following an example to applying it to
solutions

I've looked at three books, one practical approach tries to describe plus
define but the explanation seems to make big leaps in my amateur
misunderstanding mind, and then two very formal math oriented with very
succinct definitions and compact proofs and examples

I've looked at these web sites and others which give similar definition and
description but no example that helps my mind capture the essence of the
pumping Lemma

en.wikipedia.org/wiki/Pumping_lemma
www.cs.brandeis.edu/~mairson/poems/node1.html
www.cs.may.ie/~jpower/Courses/parsing/node41.html
www.cs.wpi.edu/~alvarez/CS3133/pumping.html

TIA for any helpful info
r


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