Hey /r/php what's the best tuts/books on codeigniter?

Im going to try codeigniter as my first PHP framework. First of all what is the best tutorials or introductions to codeigniter?
I'll be (trying) to make an app consisting og one page where everything will be updated through ajax with login, userpage and all that good stuff. I was wondering if codeigniter is a good framework for that type of project?
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@pilecarls8,

What version of CI are you planning on using(CI3 or CI4)?

There are many tutorials for CI3. There are some for CI4 but it is relatively new. Simply do a Google search and you will find a lot of tutorials. There is a tutorial in the online user guides for both CI3 (https://codeigniter.com/userguide3/tutorial/index.html) and CI4 (https://codeigniter.com/user_guide/tutorial/index.html) - check them out.

Also, if you wish to support CI and get useful tutorials feel free to support kilishan (Lead and main developer of CI4) https://forum.codeigniter.com/thread-71046.html

Your going to get a biased opinion here since this is a CI forum. Bottom line is that CI is a powerful framework that can do many of the same things that the other popular frameworks can do. Yes, there are differences but in the end CI is a widely used PHP framework.

Actually, if you check the history of the most popular PHP framework the creator was influenced by CI ( https://en.wikipedia.org/wiki/Laravel).