When I begin writing a post, I see some help text, that includes

Use Markdown or BBCode to format

OK, but there is no reference for what Markdown or BBCode is!

I’ve discovered a few things by experimenting, like apparently asterisks can make things italic and I can type HTML entities like → that.

I’d like to learn more. Where can I find resources on how to use Markdown and BBCode?

Good news! Now there’s an excellent way to learn Markdown – a quick reference, plus an interactive tutorial:

commonmark.org/help

Note that we only support BBCode as a shortcut aid to learning Markdown, it’s not really “native” … so try to learn Markdown!

The official BBCode reference is at:

bbcode.org/reference

Note that a safe subset of standard HTML also works, as it is supported in Markdown.

So you can type any of these:

this is <b>bold</b>.
this is [b]bold[/b].
this is **bold**.

and get

this is bold.