Read the docs / documentation / API docs (and contribute)

Read the source

Write tests with test assertions and run them with a test runner

Learnxinyminutes > Lua: https://learnxinyminutes.com/docs/lua/

Learnxinyminutes > Python: https://learnxinyminutes.com/docs/python/

Yeah exactly, and they'll only know things that people tell them about. So tell them about Luanti.

I have given lots of classes to kids and young people, and if I followed your logic there I would have only told them about stuff I thought they already knew about. Luckily, I didn't.