Should you learn Delphi or VBA just for yourself?

Question

Delphi

Hello! Recently I've been interested in Delphi, I was touched by the fact that it was created for "Applied Programming". My goal: I want to do cybersecurity and have already come a long way. I know C++ (I won't stop learning), C#, Python and many other languages, I also learn Assembler(NASM). My goal is to learn how to create antiviruses and understand all sorts of malware. So, is it worth learning for this - Delphi? Or is Visual Basic better?
I want to note: I am not going to work on freelance or other sites, I choose a language not for simplicity or for vacancies, but for what knowledge I can get during development on it! Also, I want to note that I need to develop cross-platform applications. That is, that the language would be suitable for writing programs both on Linux and on Windows. And yet, some will wonder - why did I enter the courts - Visual Basic? The answer is simple - I have a friend who makes money in VK by creating viruses and all sorts of programs in Visual Basic, so I decided to add, maybe I can also make money on this :).
Added: to be honest, I'm more in love with C ++ (no matter what they say, they say it is not suitable for malware, antiviruses, they say C is suitable for this, but I like C ++ with its syntax, simplicity and OOP), and also attracted me Assembler, but I rather learn it purely for my own sake. I mainly use C++ and Python. In general, I was interested in Delphi, I want to add it to the list of USED programming languages.

Answer 1

If you know C++ C# and Python, then why the hell do you need Delphi and the topic is more Visual Basic, which is never cross-platform (although, yes, mono?) ???
anything can be written on the above three.
and in C ++ no one bothers to write in a procedural style like in C :))
I don’t understand at all, to be honest ))
Do you have a lot of extra time, I guess?