If these are your first steps, head over to the New Arrivals Guide.
There are many ways you can contribute to this wiki:
You can also create new pages and entire sections.
Topics are regrouped under “namespaces” which are literally sub-directories.
For example, visit this page to create a “Matlab Basics” tutorial:
The link format means it is under section “Tutorials → Matlab”. When you first access it, it is an empty page. If you edit it and save it, the page is created and all internal links (including the one above) will point to your page.
Head over to the Registration page to create your wiki account.