Firstly, you need to know that in playing the piano there are two ways – by note reading and by the chords. What would you like to do? You have to answer this question. If you simply want to play existing piano music, you must know how to read piano notes. On the other hand, if you want to write inspiring piano music, you must be able to understand the piano chords. If you can learn how to read notes as well as the chords, the better.
Still, if you want to learn to play piano in quick and easy steps, learn the chords first. By doing so, you will know the different sounds of the chords. Note reading can be taken up later.