For all users who are newbies to cryptocurrencies, here's a list of website that can help to understand bitcoin :
Informations :
https://coinmarketcap.com/currencies/bitcoin/ (chart and price)
https://cryptowat.ch/bitfinex/btcusd (live chart)
https://bitcointalk.org/ (talking about bitcoin and coins)
https://www.coindesk.com/ (bitcoin and crypto news)
https://www.coindesk.com/price/ (bitcoin live price)
https://bitcoin.org/ (Official website)
Exchanges :
https://poloniex.com/
https://bittrex.com/
https://www.bitfinex.com/
https://hitbtc.com/
Earn FREE bitcoins:
https://freebitco.in/?r=905671
http://moonbit.co.in/?ref=bc1457698904
Don't hesitate to give ideas in comments :)