Here are samples of every built-in callout type.  
Syntax reminder:

[!type] Optional Title
Content goes here

#### Examples
> [!note] Note
> This is a plain old note.

> [!abstract] Abstract / Summary / TL;DR
> Use this for summaries or overviews.

> [!info] Info
> Highlight useful information.

> [!todo] To-Do
> Track things you still need to do.

> [!tip] Tip / Hint / Important
> Handy tricks, hints, or critical notes.

> [!success] Success / Check / Done
> Something worked or is completed.

> [!question] Question / Help / FAQ
> Open questions, help prompts, or FAQs.

> [!warning] Warning / Caution / Attention
> Watch out! Something needs care.

> [!failure] Failure / Fail / Missing
> Something didn’t work, or something is missing.

> [!danger] Danger / Error
> Something is broken or risky.

> [!bug] Bug
> Known issues or problems.

> [!example] Example
> Provide examples or demos.

> [!quote] Quote
> Highlight a quotation or external text.