Welcome to the Linux community!

There's a certain set of us Linux users who cling to the adage "for beginners, distro doesn't matter much." A lot of the differences between distros are things under the hood that you won't notice or care about. The main two things that will change your experience are the DE and the package manager.

DE = Desktop Environment. The GUI, what it looks and feels like. This is a matter of personal taste, you can find DEs that look and work more like Windows, more like MacOS, or neither. Try out a few, pick which one you want. I like Cinnamon because they tend to put things where someone who's used to Windows, but doesn't really like Windows, would look for things. Again your choice of DE is personal taste.

Package manager = app store. Think about smart phones, a major deciding factor is which app store(s) it has access to. My Samsung Galaxy has both the Google Play and Samsung Galaxy stores. If you buy a Pixel, you don't get the Samsung store. If you buy an iPhone, you're stuck with Apple's App Store. Go back to what? 2014 or so and buy a Fire Phone, you're stuck with Amazon's app store. Same thing with Linux distros.

In practice, most mainstream distros will support practically all Linux software in some way. I run Linux Mint, Mint comes with APT and Flatpak, and between the two I can find all the software I want. (Asterisk: video games, for which I have Steam). Other distros will have technically different but functionally similar package managers; on Arch you'd use Pacman, on Fedora you'd use RPM. The Steam Deck uses only Flatpak for user apps.

So go with a fairly mainstream distro that has Flatpak support either out of the box or easily installed and you'll be okay.

Different tools handle that differently. Takes a little extra eye adjustment to tease out the information from df -h, for example.

reminds me of /proc always being 128TB for no reason