Install a new package:
sudo apt install <package_name>
Remove an installed package:
sudo apt remove <package_name>
Update installed packages:
sudo apt update
sudo apt upgrade
Note that before running the apt upgrade command, you should run the apt update command to update the list of packages. In addition, although software upgrades are usually safe, sometimes new versions may introduce incompatibilities or other issues, so it is best to ensure that your system and applications are backed up before upgrading, and to be cautious about upgrades in production environments.
Search for a package:
apt search <keyword>
Display installed packages:
apt list --installed
Display package details:
apt show <package_name>
Download a package from the software source but do not install it:
apt download <package_name>
Display upgradable packages:
apt list --upgradable
Automatically remove packages that are no longer needed: sudo apt autoremove. Note that although apt autoremove is usually safe, when deleting packages, always carefully review the list of packages to be deleted to ensure that important software or system components are not accidentally deleted. If you are not sure whether a package can be safely removed, it is best to do some research or consult relevant personnel first.