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https://www.markdownguide.org/extended-syntax/

This has most of the extended syntax, including footnotes[^1]. I use the syntax highlighting quite often, and a few markdown editors/previewers support mermaid.js which is pretty cool if you need a simple diagram and you don't want to mess around with a more complex app.

[^1]: If you are talking about Lemmy formatting specifically, I don't think it's feature complete yet, but it does support some things that aren't documented

https://www.markdownguide.org/cheat-sheet/

==Important text == can be highlighted. I actually didn’t know about this one

Here's a sentence with a footnote. [^1]

[^1]: This is the footnote.

```language name
syntax highlighted text
```

string code = "highlighted";

SELECT example FROM knowledge WHERE actualSource = StackOverflow

+ added examples
- removed mistakes

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Mermaid diagrams, where supported, I feel are invaluable in tech.