Wow, first of all I should say, It's an honor for me to have your answer to my question. to clarify my question I just want to add that, when I go to courses section i see a menu of fundamentals and theory , techniques , etc as a beginner, should we start these section one by one, for example playing scales, then arpegios, then go to techniques and then harmony and so on? is that the right ordering?

Hey Dezashibi! I had the same question when I started the OC. I've been here over a year now and started from the beginning with no classical training (I played by ear for many years). Anyway, bearing in mind that we all have our own unique manner in which we learn, I found that it was best to start with the scales, modes, arpeggios, etc., and then gradually attempt to play them along with the sheet music. At first I couldn't read musical notation so I downloaded a cool little app called "Musicnotes" and learned how to read. From there I gradually moved on to the Etudes section of the OC while still keeping my core practice of scales, modes, and arpeggios. So if you think of the OC curriculum less as an arid, linear one and more like a mandala-like one which spirals around a core of fundamentals and basics then you should be able to get the most out of the OC I hope this helps. Be well. Daniel

Thank you Daniel :) it helped me alot