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This is a nice blog post by SO on some internals of git. Branches are just pointers to commits and how switching branches, changes where HEAD is pointing to. It’s worth the read, but if you just wanted to skip to the internals of git then scroll down to ‘How do branches work technically, under the hood?’. It has some nice screenshots
– mfaani
Commented Apr 8, 2021 at 14:15

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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)
```
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for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
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[example](https://example.com)
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