When I was a beginner and used Linux Mint, I downloaded deb files, and even rpm files that I converted to deb, because I didn't know what package manager means
I didn't actually mean that you install deb packages from the internet, I mean debian based distros, I just don't know the acronym for it.
and AFAIK mx linux and LMDE have programs with a GUI for installing packages, and I added debian because it has a gui installer and I don't know a good third debian based distro