This is where you find simple Php and Html code snippets. I'm using this first and foremost for my own reference when making changes to themes and other basic things. I will be adding Php and Html scripts for simple changes whenever I come across them.
This does not stop you for adding tutorials for your own reference as well. But please, keep it simple. There are tons of advanced Php and Html tutorial sites out there, such as W3schools for one example, which is my go to for help and references.