Lot of great recommendations so far, but I will mention some of my favourites in case they were missed in the other comments: hyprland for a Wayland compositor / window manager, so you can easily set up keybinds for whatever you want, rofi for launching programs (and much more, I even made rofi-games so I can launch all my games from one place), and yazi for the file manager (use a lot of TUIs in general though).

You CAN go more extreme with the no mouse journey by using something like qutebrowser as your browser but I just use Firefox/librewolf with vimium c and find that’s good enough for me.

Finally, someone who understands science