Partitioning of hard drive(s) can be tricky for the new user. The
Debian Installer provides options to partition your disk in a number
of ways. It recommends a simple, single partition, which is a good
choice to start with. Another good choice is to create two partitions,
one of say 10GB for / and the remainder for /home.
This way you can wipe out / and reinstall GNU/Linux and still
retain your /home files. Unless you know what you are doing,
stay with one of these simpler schemes, although a fuller discussion
of Disk Partitioning is included in Chapter 69.