i am new to bitcoin.
may i know where do you normally buy bitcoin ?

You should avoid untrusted websites and sellers.
I got scammed for a couple of btc

The easiest way is localbitcoins or a safe exchange (like bitstamp).
yup. bitstamp is the way to go. it is not only safe, but it is also one of the largest ripple gateways out there.
i think
ripple might interest some of you, it's more than just a 'coin', it's a complete payment system with an exchange built in. you can trade both fiat currency and cryptos in ripple.
anyway, to learn more about it, read here:
http://coinjoint.info/ripple-might-want-pay-attention/ and there are intros and guides here:
https://xrptalk.org/forum/61-faq-and-guides/