A single line return
disapears

A single line return disapears

A double line return

Gives a new paragraph

A double line return

Gives a new paragraph

A double space at the end of a line  
Gives a new line

A double space at the end of a line
Gives a new line

Same for ending a line with a \
You just get a new line

Same for ending a line with a
You just get a new line

And to recreate this example
```

    gives
 a  block  of
  preformed
    code

```

>And starting each line like this
>
>Gives a block quote\
thought it's not needed if you use a simple line return\
or two

And starting each line like this

Gives a block quote
thought it’s not needed if you use a simple line return
or two