Information security for the web. What programming languages ​​are needed?

Question

Python

Do I need C/C++ and which one, do I need an assembler, do I need python or ruby ​​on rails?

Answer 1

Javascript first.
For the exploitation of many web vulnerabilities is implemented using it.
PHP - as the most common for web. And it is also full of vulnerabilities.
Everything else is needed much less.