Like a lot of other IDEs, it is convenient to have a console to focus over to then run ad-hoc cmdline stuff or run tests for the currently active project. This is what I use :terminal for the most. It was helpful for me to setup the below keybingds for focusing back/forth between a :terminal split and my "editing" splits:

    tnoremap <C-h> <c-\><c-n><c-w>h
    tnoremap <C-j> <C-\><C-n><C-w>j
    tnoremap <C-k> <C-\><C-n><C-w>k
    tnoremap <C-l> <C-\><C-n><C-w>l
    nnoremap <C-h> <c-w>h
    nnoremap <C-j> <c-w>j
    nnoremap <C-k> <c-w>k
    nnoremap <C-l> <c-w>l