Fish

I think I like fish more than zsh, but still undecided. Not being able to copy paste commands online intended for bash can be annoying but other than that it is quite good and has nice defaults.

sudo apt install fish
# oh-my-fish
curl -L https://get.oh-my.fish | fish

# install robbyrussell theme
omf install robbyrussell
 
# set theme
omf theme robbyrussell

Aliases are created by simply creating a file in ~/.config/fish/functins

Example mkcd

function mkcd
    mkdir -p $argv
    and cd $argv
end