The plugin tutorials are in the my-plugins/ folder.


Plugin Tutorial 1
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A basic plugin with a text match, a regular expression, and version extraction.


Plugin Tutorial 2
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Building matches from HTTP server headers.


Plugin Tutorial 3
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How to make version 0.2 of a plugin.
Matching cookies.
Google dorks


Plugin Tutorial 4
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Server header
Cookie value


Plugin Tutorial 5
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Aggressive plugins.
Searching for known files and recognising versions from MD5 hashes.


Plugin Tutorial 6
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Custom functions for passive and aggressive detection 


Plugin Tutorial 7
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All the different types of matches.



After looking at the tutorials look through the other plugins to see how it is done.

There are more resources in the wiki https://github.com/urbanadventurer/WhatWeb/wiki