As a beginner, it’s quite complicated to align oneself with the crypto market where you have to research and analyze a lot of information including the various cryptocurrencies as well as exchanges for their purchase. The good websites for crypto news are Cointelegraph, Coindesk, Coininsider which I use. And here you can find the resources about everything concerning bitcoin (https://lopp.net/bitcoin.html). Regarding the sites for buying crypto, I agree with the mentioned ones Coinbase, Binance, CEX are the best for newbies.
I trade on Digital Ticks Exchange,
its a crypto exchange that has no trading fees till 31-12-2019 and also a demo trading version to trade on for new traders