How to use Mercurial?

[Harry Putnam]

Michael Ekstrand <michael at elehack.net> writes:

> For me, it isn't a different working practice so much as a mindset
> change.  If you follow the rule that you never have a dirty working dir
> while merging, then a copy your work is always saved before you merge.

Just a noob trying to follow along here.  OP sounds like stuff I might
run into.

Can anyone define a little more precisely what is meant by the term
`dirty' in this context?