Answer

How to format command's answer?

Use markdown text:

\n - new line (multi-line text also allowed)
*bold text*
_ italics _
[text](URL)
`inline fixed-width code`
```text
pre-formatted fixed-width code block

How to insert a link to the answer?

[link text](url)

Example:

[Google](http://google.com)

How to insert a picture to the answer?

[picture title](url)

Example:

[Dog](http://example.com/images/dog.jpg)

Also you can send picture file directly with BJS.

How to insert a other command to the answer?

Just use such text /command

Example:

Hello! You can now /register or read /help

How to insert a link to other command on the answer?

It can be with "/", e.g.: /help. Otherwise, unfortunately, no.