How to easily learn codeigniter 3?

Hi guys, noob here. I am a new hired dev that the team focuses on codeigniter 3, are there any tips or guides i can use to train my codeigniter skills?

slope

Best guide is the CodeIgniter 3 Users Guide.

View other users code.

Search google - Codeigniter 3 Applications with source code

etc;

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

There is no point in learning outdated versions. Soon, PHP 8.1 8.2 versions will become outdated and you will not be able to work with the framework correctly. You will lose time.
It is worth looking towards CI 4.5

Simple CI 4 project for beginners codeigniter-expenses ( topic )