Hi I am a newbie and I am planning to invest ETH coin but I only have limited amount of money to start investing. Can I buy less than 1 ETH?Your response are greatly appreciated.Thank you. 
Yes, it is possible.Only requirement is that you have account in any exchange and funds in your BTC wallet to purchase ETH. There is no limit to buy 1 ETH, you can buy for any amount and you get ETH as per your buying value. No limit on minimum buy on any altcoin but some exchanges require minimum amount of buy. Bittrex require minimum buying of 0.00050000 BTC and Yobit require only 0.00010000.