Esoteric Languages are put in place to make jokes, test concepts, and solve challenges! That being said, here's some challenges to try on any esoteric language you find!
“Hello, World” in esoteric languages: https://esolangs.org/wiki/Hello_world_program_in_esoteric_languages
Chicken: https://esolangs.org/wiki/Chicken
Gravity: https://esolangs.org/wiki/Gravity
Fugue: https://esolangs.org/wiki/Fugue
ArnoldC: http://lhartikk.github.io/ArnoldC/
LOLCODE: https://github.com/justinmeza/lolcode-spec/blob/master/v1.2/lolcode-spec-v1.2.md
Whitespace: https://en.wikipedia.org/wiki/Whitespace_(programming_language)
Brainfuck: https://esolangs.org/wiki/Brainfuck
- Ook!: https://esolangs.org/wiki/Ook!
- Blub: https://esolangs.org/wiki/Blub
- Brainloller: https://esolangs.org/wiki/Brainloller
- Pi: https://esolangs.org/wiki/Pi