Fixed or Percentage Brokerage - Which is better for Beginners

que 1) I wants to know that zerodha trading in stock or commodity or on both ?

yes, you can trade in both stock and commodity in Zerodha

que 2) I am a beginner so initially i wondering to trade in intraday with very low capital, so my question is Does % or fixed brokerage would be better for me ?

Fixed brokerage is always better and lower ... And in Zerodha, max brokerage is 20 Rs ... When you trade with low capital, brokerage can be lower like 3 Rs also, based on your turnover ...