I've worked with Visual FoxPro and am just picking up SQL Server.

When I install SQL Server 7 I end up with:
- Microsoft SQL Servers
- SQL Server Group
- MDONALDNT (Windows NT)
+ Databases
...

What is Microsoft SQL Servers? Is that the software?
What is the group?
Why would I want to create another group?
Would all databases go in Databases or would I ever want to create another (Microsoft) SQL Servers?
How do I set things up so I can transfer my work to my notebook?
How is the transfer accomplished? What do I back up?