I want to invest in stock market(less than 20k rs) and for that purpose i have to open a demat account(online). i am a novice and dont know much about trading and trading accounts. while searching net i came across sbi, icici direct, zerodha and rksv accounts. The problem is zerodha and rksv is called as discounted trading account (i dont know what it is) where as sbi and icici is called demat account. so if i want to start a trading account which of these four accounts should i open? which of the above four account is best for a person whose investment is less than 20000rs? I personally like SBI because of its reputation as a efficient banker, whether sbi is good for a investor like me.