rmdir practice
This will delete the last remnants of your practice session.

So now you know how to create, copy, move, rename, and delete files and
directories. You also learned some shortcuts, like typing simply cd to
jump to your home directory, and how . and .. refer to the current
directory and its parent, respectively. You should also remember the
concept of the root directory, or /, and the alias ~ for your home
directory.

Dot Files and ls -a

When you type ls, files beginning with a dot are not listed.
Traditionally, files that contain configuration information, user
preferences, and so on begin with a dot; these are hidden and out of your
way while you do your day-to-day work. Sample dot files are ~/.emacs,
~/.newsrc, ~/.bashrc, ~/.xsession, and ~/.fvwmrc. These are used by Emacs,
news readers, the Bash shell, the X Window system, and the fvwm window
manager, respectively. It is conventional to end the dot filename with rc,
but some programs don't. There are also directories beginning with a dot,
such as ~/.gimp and ~/.netscape, which store preferences for the Gimp and
Netscape.

Sometimes a program will create a dot file automatically; for example,
Netscape allows you to edit your preferences with a graphical dialog box
and then it saves your choices. Other times you will create them yourself
using a text editor; this is the traditional way to do it, but you have to
learn the peculiar format of each file - inconvenient at first, but it can
give you a lot of power.