pwd shows your current location, ls lists files, and cd changes directory. cd .. goes up one level, cd ~ goes home, and cd - returns to the previous directory. Use ls -la to see all files with full details.
Moving Around
pwd # print working directory
ls # list files
ls -la # detailed list with hidden files
cd /var/www # go to absolute path
cd .. # go up one level
cd ~ # go to home directory
cd - # go to previous directory