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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
``` - put returns between paragraphs
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expand(andunexpand) default to 8, but other than that, I think it mostly comes up when printing to the terminal. And that's up to the terminal settings. (I would expect full-screen editors to deal with tabs themselves, again, by configuration). But for the usual text-processing tools (awk, cut, sed, shell language functions, whatever), the tab is just a single character, mostly like space.