Supported formatting in posts (markdown, BBCode, and HTML)

You can make use of this guide:

(And see it in action here: 📜 [Wiki] Schlumpf hub serial numbers reference - Unicycles and Equipment -

Or use this plugin that extends BBcode support:

As for the allowed HTML tags, I believe this is the reference:

Though I don’t find table HTML tags (which are allowed) inside for some reason.

Maybe because they are referenced here: