My ideal platform for programming tutorials:

- is open-sourced so you can run the platform on your own website

- developers can easily keep track of what tutorials they started/finished and search in them

- authors own their tutorials and can monetize them

- has built-in programming environment - something more like a notebook where you can see both text + code on the same level. Also partly Repl.it so you can start the tutorial asap without any hassle in your browser

- code is the first-class citizen

- tutorials can be versioned

- tutorials have issues

- tutorials can be cloned and accessed offline

- tutorials can be forked