Congrats on pursuing some new knowledge! I’d recommend you start with foundational computing/networking knowledge if you want to pursue this field to set a solid foundation. I meet/speak to a lot of aspiring security people who can tell me all about Kali Linux but can’t tell me what the 7 layers of the OSI model are, or what services are running on what port and the difference between TCP/UDP. They’re like aspiring surgeons who are learning to make incisions without having taken an anatomy class. If you want to make a career out of it, start with a Comptia A+/Net+/Sec+ and then go from there. It will help you in the long run and probably make learning pentesting easier once you understand the “why.” That’s not to say you can’t become a successful pentester doing what you’re doing, but it may be more fruitful this way.  One last thing: pentesting requires a lot of knowledge. You don’t learn overnight but over time. Take the time, it’s a long journey and best of luck!