cd
Change Directory.
mkdir
Create a new folder (directory).
touch
Create a new file.
rm
Remove a file.
cat
Show contents of a file.
pwd
Show current directory (full path to where you are right now).
cp
Copy file/folder.
mv
Move file/folder.
grep
Search for a specific phrase in file/lines.
find
Search files and directories.
vi/nano
Text editors.
history
Show last 50 used commands.
clear
Clear the terminal screen.
tar
Create & Unpack compressed archives.
wget
Download files from the internet.
du
Get file size.