Some text formatting questions

When I write some text in vim and enter each item preceded by "-" like:

- text text text text text text text text text text text text text text
text text text text text text text text text text text text text text
text text

the lines from the third is not intended. Is there a way to correct
this?

Also if I edit text already written with backspace, then the text that
is left get one extra whitespace. Is there a setting for this?

Jostein

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