ls - Answer "List," lists files and directories.
pwd - Answer "Print Working Directory," shows your current location as an absolute path
cd - Answer "Change Directory" Allows your to change directories using absolute or relative
paths
tree - Answer Allows you to view the hierarchy of a directory
tty - Answer "teletype," used to identify your current terminal session.
clear - Answer clears the terminal screen
which, whereis, type - Answer Provides the absolute of commands location
uname - Answer identifies important information about the current system
lscpu - Answer Lists CPU information
man - Answer Provides documentation for various things
mandb - Answer Updates the man pages on a system
whatis - Answer Provides a brief description of something