If want to create a new language such as c++ , javascript ...etc ! , what i will know ?

Answer 1

Python is built upon C++.
Scala is built upon Java.
To build any language you need to have a very depth knowledge on any of programming language and computer architecture.

Answer 2

Ken Thank you so much
But which built up c++ and java .
Because i need to built up a code generating onther defined code.

Answer 3

This this blog. It explains it https://medium.freecodecamp.org/the-programming-language-pipeline-91d3f449c919