Hello, Cyf here.

I'm attempting to learn about complex numbers and I was wondering if anyone had any resources? I've gotten as far a complx conjugates because I have no idea what they are and I've also been given this diagram which I don't understand. Could anyone explain it to me and explain what is arg(z)?

I don't differentiate between books or sites, as long as either are clear, simple and for the amateur (self-studying, never done this before)

Any help greatly appreciated.

~Cyf

Edit: I forgot to ask, what does a triple dash mean? Like an equals sign but with one more hyphon in it.

Edit: Sorry for forgetting the diagram. Here it is: