You go to AE's online help, you put in the search term warp stabilizer and find the fine training materials that are available, and you STOP TRYING TO USE IT INTUITIVELY, and STOP ASKING FOR HAND-HOLDING.
There's too much motion in the clip for the stabilization options you are using, which would result in a lot of cropping. If you have stabilization result set to "No motion" you could set it to smooth motion instead.
""To avoid extreme cropping set framing to stabilize only or adjust other perimeters." How do I do that?"
To set framing to "stabilization only", in the effects tab of your clip, under the "Warp Stabilizor" effect, open "Borders", next to "Framing" change it's setting to "Stabilize only"
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