NOTE: Please keep in mind that depending on who you talk to the basics can and often do differ. The above list are the basics that I studied when I first started practicing and are what I teach my students. You can add to this list or take subjects from it depending on your interest or what you feel you need or don't need to learn. However, I suggest studying all of them because you may very well need to know them in the future.
If you look around Newbie Central on the Home page they have more info on the basics there if you want to read more about them.