Basic piano chords, in my music studio, are the I, IV, and V chords in root position and inversions.
Some kids are ready to play these chords before they read well. I have a few beginners who need to play chord inversions in a few of their duets and solos, and the basic piano chords on this free download are a good way to introduce them.
If you look carefully, you'll see that this page of chords and major C scales is just the same as the beginnings of the "Key of C" sheet on my 12 Major Scales page.
So why did I feel the need to make this "dumbed-down" version of the Key of C sheet? I did it for little guys and gals who are capable of playing more complicated music than they can read, and WANT TO. The letters-inside-the-noteheads are a lot like pictures - and a picture can be worth a thousand words!
Do you have any students who seem to be allergic to the printed page? They wish to hear and memorize INSTANTLY every new piece or technique, but they frequently learn it WRONG because of their haste. These notes-as-diagrams help them.