All i see is a source engine console in the pic, not really a terminal as in terminal emulator. console is more correct here i think

I’m hoping to transition from left to right wihtout going through the middle stage.

May I introduce you to the simple life of just using whatever text editor and terminal that comes presintalled on your favoraite distro? It’s ridiculous how far this can get you, I’ve been enjoying gnome text ediotor with gnome terminal.