You probably already know at least 1 scale... C Major. C,D,E,F,G,A,B,C. All white keys. That's where everyone begins when they start learning.
There are things that go along with each scale you need to learn too. For beginners those are:
Chords
Chord inversions
Key signatures. (For C Major there is no Key Signature. The staff is blank with no sharps or flats at the beginning next to the Clef. All other keys have some combination of sharps or flats at the beginning of the score. The self study books do a very good job of not telling you that stuff.)
As you progress you get to learn new terms and other stuff like relative minors, but that's for later so don't worry about them now. Concentrate on your lessons and ask questions about stuff you don't understand clearly.