This depends on the distribution you're using. Many beginner-friendly distros have "app stores", such as Ubuntu's Software Center or Pop!_OS's Pop!_Shop.

If you can't find anything like that, you might need to use a command-line package manager. Most common distributions are based on Debian and thus use `apt`, which does have a graphical version called Aptitude. Other possibilities include `rpm` for Fedora and `pacman` for Arch-based systems, as well as the cross-platform solutions `flatpak` and `snap`.

Rarely, you'll need to install apps from third-party websites instead of a centralized repository. If your downloaded file ends in `.deb` or `.rpm`, it's a package for Debian or Fedora respectively. If it ends in `.appimage`, it's a portable app that doesn't require installation; simply make it executable in the file properties window. If it has no extension at all, you can try that too, but it might need other files to be in the same folder as it.
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