surf? LOL

I’m not a big fan of file managers but a GUI one like thunar is good for the sake of drag and drop.

I always install a second terminal emulator like xterm just in case of “uh oh I broke my terminal emulator”… that can happen sometimes with urxvt after updates if you do particular addons or bash configurations and such

cups if you like to print

I like dictd as a dictionary

ufw

potentially appropriate microcode for your hardware?

zathura for pdf

always install tmux and run it in your ssh instances