I found an online piano lesson on youtube that really catches my interest. So,I am planning on learning to play piano but can’t afford to buy one for now. Can I learn how to play piano using a digital keyboard? Will it be the same as piano? Any suggestion on what type and brand of keyboard that i can use? hoping to find a cheap one 
I think keyboard has less number of keys than piano. But you can play infinite number of sounds using combinations in a keyboard. It depends on the software. Piano reading has its own way. I think you cannot learn by a digital keyboard but can play sounds. It will not be the same as piano.
But one thing I am not sure is that is their any modern keyboard now available in the market?
The main difference is that a keyboard is to control the software in a computer, but a piano is for producing sounds only.