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