FORTH (or Forth if you don't like the caps-lock key, it's not an acronym) is a programming language that was developed in 1970. It's really simple, but it's really powerful as well. It also inspired several esolangs such as FALSE.
A good resource for learning FORTH:
https://skilldrick.github.io/easyforth/
Run forth code here:
https://tio.run/#forth-gforth
MUSIC USED:
"Jumper 2" by Waterflame
"Starbound" by Itro x Valcos
"Anti-Sad Song" from Karoshi 2.0
"Hypnospace Teentopia Anthem" from Hypnospace Outlaw