I want to start learn hacking, what should I start learning first?

Hello, I want to start getting into hacking, but I know that there are a lot of fields of hacking, and they all interesting me.
So my problem is that I don't know where to start.

I'm currently learning CCNA R&S, and I have basic understanding of how to use Linux distributions like Debian, Ubuntu, Kali, CentOS7. I have also some background in penetration testing (I would say amateur level - basic network attacks, server side attacks, and client side attacks, and some social engineering).

I know Python programming language and learning C right now.

I have a few goals that I want to be able to archive:
- be able to break into secure networks and systems and websites and script my own attack scripts
- be able to reverse engineer and perform binary exploitation and develop exploits (for systems and for games)
- develop malwares

I know what each field requires me to learn, but I just need a direction according to my goals, what should I start with and what to learn after?

In order to successfully bypass firewalls, exploit frameworks, etc, you need to understand how they work.

What I used to do, for finding vulnerabilities in forums, etc, would be to download the forums software, for example: myBB or vBulletin, and install it on a test site. Then I would proceed to find vulnerabilities within the site to try and exploit them.

Id suggest learning OPSEC first and above all else.

I'd suggest learning basic programming and how to understand computer networks properly.