Emacs

An editor | a lisp interpreter with an editor | an operating system scriptable with a lisp (interpreter) with an editor | a lisp machine that is an operating system (scriptable with an interpreter) with an editor

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Editor

Lisp

A .. pretty nice environment to do all of your “generally working with text” stuff in.

Also relatively arcane, complex, and hard to tame.

My recommendation to start using it is definitely Doom Emacs (which makes things a lot easier in my experience).

You should not, in any way, start using it before having a proper habit of version controlling your config files. (Psst: The easiest way to do that is magit (running inside Emacs))