Google Searching for Codeigniter User Guide

Another thing worth noting is that some of this has to do with your own search history (and other information the search engine is tracking). When I type codeigniter into Google, the first entry that comes up (after the ad(s)) is https://www.codeigniter.com with additional links broken out for the User Guide, Download, Documentation, and Tutorial pages. After that, I get two EllisLab links, followed by Wikipedia, GitHub (and the CodeIgniter-RESTServer GitHub), Stackoverflow, and Twitter.

Bonfire

Practical CodeIgniter 3
CodeIgniter Testing Guide