How does merging work?

See [:Merge:merge]

What are some best practices for distributed development with Mercurial?

See [:WorkingPractices]

How do I import from a repository created in a different SCM?

See [:ConvertingRepositories] for various tips.

What about Windows support?

See [:WindowsInstall] for getting started using Windows.

Is there a GUI front-end?

See [:OtherTools] for information on graphical merge tools and other front-ends.