macOS is my favourite operating system. Finder in column view with arrow keys to navigate, combined with space for file preview, is incredibly fast and intuitive. Trackpad integration also results in less hand movement. I'm building a Linux (Bazzite) desktop, though, and I've set my sights on the stars.
nnn looks to be an incredible file manager, and was a great recommendation. It looks even more capable than Finder, albeit without scrolling/zooming previews, thanks to macOS having unmatched trackpad functionality. Not to mention Spotlight, which makes opening apps trivial--especially with Alfred available as well. I want to go beyond mere file management, though.
File managenent, browsing, gaming, everything. Just how much can you configure a Linux system to eliminate mouse usage? Shortcut guides welcome (I already know the major ones). I also have a keen interest in tiling window managers, but I've not delved that deep yet. I don't know how to set one up.
Guess I'm forced to learn Emacs/Vim/similar.
To achieve this you will need a tiling window manager like Sway, Hyprland, or i3 and try to use as many CLI-based programs as possible for everything else. For browsers, there are projects like Nyxt (and some others I can't remember) that allow you to use vim or emacs like shortcuts to browse around.
However most GUI apps probably won't support an all-keyboard workflow so you will still need one. Depending on what software you use, however, you could make the vast majority of your regular computing mouse-free
Additional browser option: https://www.qutebrowser.org/
luakit works similarly too