Purchasing bitcoins online
there are lot of grate websites where you can buy bitcoin..

example: coinbase.com, blockchain.info

https://www.bitcoin.com/buy-bitcoin &lt;-- here are some ways to buy
http://cryptosort.com/wallet &lt;-- here you could find something as well..

but if you are starter i suggest you to use coinbase, because there is simple interface and 3 cryptocurrencies available :)