Buster installing software

Debian uses the Advanced Package Tool (APT) suite to manage installation of prebuilt applications. The APT tools require a network connection to the internet in order to automatically download and install new software. The update command will download a list of the current versions of available packages:

apt-get update

A common example is installing a simple web server like nginx. Find the package name first with search, and then install it:

root@host:~# apt-cache search nginx
...
nginx - small, powerful, scalable web/proxy server
nginx-common - small, powerful, scalable web/proxy server - common files
nginx-core - nginx web/proxy server (standard version)
nginx-dev - nginx web/proxy server - development headers
nginx-doc - small, powerful, scalable web/proxy server - documentation
nginx-extras - nginx web/proxy server (extended version)
nginx-full - nginx web/proxy server (standard version with 3rd parties)
nginx-light - nginx web/proxy server (basic version)
nginx-confgen - nginx configuration file macro language and preprocessor
...

In this case, the wanted package will likely be the nginx package itself. Names of packages can be found on Debian's wiki pages or the Debian packages site.

With the package name apt-get install can be used to install the prebuilt packages.

apt-get install nginx
# More than one package can be installed at a time.
apt-get install nginx nano vim vbindiff

For more information on using the various APT tools, refer to Debian's APT documentation.