cd - change current working directory.
Change current directory to /usr/bin :
cd /usr/bin
Return to previous directory:
cd -
Go to parent directory:
cd ..
Return two dirs up:
cd ../../
Switch to home directory:
cd
cd ~
Switch to root directory:
cd /
Go to first directory starting with letter 'c':
cd /home/c*
Switch to a directory containing white spaces:
cd my\ dir
cd "my dir"