That is a very interesting list of topics, @yawaramin!
If I remember correctly http://ocaml.org/learn/tutorials/ is saying this on top:
Your Help is Needed
Many of the tutorials below need updating and tutorials on many new topics are needed. Please contribute by visiting this project’s repo on GitHub; you may use the issue tracker there to request or offer new tutorials. Thanks!
So perhaps we could direct some of these there instead of creating a new portal?
Or, we could build a new wiki, such as https://wiki.haskell.org/Introduction.
Both of these approaches can use community contributions, but we might need to measure which are friendlier, creating PRs for ocaml.org tutorials or creating and editing a wiki page.