Install packages:
sudo apt-get install <package>
Remove packages:
sudo apt-get remove <package>
Update package list:
sudo apt-get update
Upgrade installed packages:
sudo apt-get upgrade
Search for packages:
apt-cache search <keyword>
Show package information:
apt-cache show <package>
Clean up package cache:
sudo apt-get clean
Remove unused packages:
sudo apt-get autoremove