Does IOTA really have a Documentation? I hear a lot about IOTA, but on the official site I found very little.

I read the WP: 
https://iota.org/IOTA_Whitepaper.pdf

but that's just concepts, I want to know details about software like "iotacore"

https://dev.iota.org/# 

The link is broken. 

can anyone tell me where I find reliable information about this  cryptocurrency?
Great IOTA tutorial playlist
https://www.youtube.com/playlist?list=PLmL13yqb6OxdIf6CQMHf7hUcDZBbxHyza

IOTA tools from the playlist
https://www.mobilefish.com/services/cryptocurrency/cryptocurrency.php

IOTA and NodeJS tutorial
https://youtu.be/Z-NN0rRcwY0

Repository for above tutorial
https://github.com/iota-community/iota-workshop