Information on the Squid web proxy is divided in to different categories:

What is a Web Proxy?
General information about the Squid proxy

Configure squid web proxy interface
An explanation of web proxy configuration options in IPFire

Proxy extensions
For advanced users - explains extensions available

Extended know-how
Optimizations and additional information for a better understanding of Squid logging

User examples of Squid Web Proxy configuration
There can be a variety of configurations used with the Squid proxy. Here are stable examples contributed by users