Answer 1

There are many many many many (...) questions like this, please for the next time use the "Search" option.

Anyway, if you are a beginner, start with Python and learn the basics of programming (variables, conditions, etc.)

Then, C++ is the most popular language for writing exploit and malware.

Install a Linux Os like Kali Linux, Parrot OS or Tails.

Tails is the better OS for cyber-security and privacy.