* `ranger` file manager: https://ranger.github.io/
* `ncdu` for visualising disk usage: https://dev.yorhel.nl/ncdu
* `htop` process monitor: https://htop.dev/
I just find them very intuitive, and information-dense while not being overwhelming.
* `vifm` file manager, more powerful and performant than ranger, for those who lean towards vim keybindings: https://vifm.info/gallery.shtml
* `btop` process monitor, for those who like eye candy: https://github.com/aristocratos/btop?tab=readme-ov-file#main...
It's a lot faster in all aspects, has mostly the same features and is pretty much a standalone binary.
edit: an even more minimal alteranative is nnn https://github.com/jarun/nnn