In this video I show you the commands to update applications and linux itself. This only works on distros that use the apt file system. These include:
Debian
Ubuntu
Lubuntu
Xubuntu
Kubuntu
Mint
Knoppix
Deepin
There are more ways to install files that are downloaded over the internet. This is just the basics on using the terminal
The commands used in this video are
sudo apt update
sudo apt upgrade
sudo apt install gimp