Like some people have mentioned, I don't think that the N4 is actually sold out. I think they're just making small batches available slowly as to not instantiate a big performance issue on their servers. Keep refreshing the page every so often and click 'Add to Cart' once you see that button. F5'ing the page and then clicking that small gap in between the 'Email' box and the 'Notify Me' button after each time you press F5 will increase the likelihood of pre-empting someone else's click (since the Add to Cart button will be located there).
You're right. You probably won't need to take any courses to learn all this stuff - this stuff can be easily accessed online. It's definitely crucial for all software developers to have this sort of CS background.