If someone does not treat you with respect you are not their friend, you are their pet.
It is no reflection on you at all, this is purely on them, but if they don’t respect you they are not treating you as an equal as they should be.
You deserve better.
A healthy relationship can include a difference of experience, knowledge, even power, but not respect. Respect is the bedrock of a good relationship and if you don’t have that you may need to look elsewhere. If you were not modelled self respect or taught it you would benefit from learning about it.
That all said, she sounds like she may just be compensating in some way, putting you down to elevate herself, but seriously you don’t have to take that. She could potentially change and stop this behaviour but she may persist and you may have no option but to get into a new friend ggroup and leave this one.
I don’t know about videos but having a look at the OSI model is a good way to start. It covers the abstract framework for packetizing data including things like the distinction between hardware and software, envelope, encryption, application layer stuff, the whole shebang. The cool thing is by going hardware, network, application you can see where responsibility are and it helps you understand where things can go wrong.
If you are interested there are plenty of CCNA style courses available on the internet, licit and otherwise, and they go into more depth, and the same applies to RHCE/RHCSA material. The training for certifications like that covers what you want to know but also puts it in context, and again licit and otherwise sources are available.