Here is a few commands to browse your files in a terminal (konsole) :
pwd
prints working directory, thus show where you are.
ls
lists files and directory of the working directory. Directory names are written in blue.
cd
changes the working directory. For example, if you open a konsole and type
cd Desktop, then press the ENTER key, you have changed the working directory from your home to your desktop.
man name_of_a_command
Show the manual page of the command.
Additionnal tip :
Press the TAB key to auto-complete a name of an existing directory or file. For example,
cd De <TAB press> automatically writes
cd Desktop.