Coindesk usually has a lot of up to date stuff. Lots of different sections.
Cryptocoinsnews is another one I look at.
Any particular coin?
If bitcoin you would mainly browse bitcoin discussion/economics here. If alt coins you need to go into the altcoin section for dicsussion and marketplace and all that. It is going to take a lot of reading to know a lot. I have 7 days of logged in time here over the yeara. That is of actual reading and commenting basically.
No specific coins, but mainly alt which I've been reading different forms watching what happens. BTC is pretty easy to find information on imo.
I'm pretty new as you could probably tell, but I believe there is a large amount of profitability to earn from coin trading. Hopefully it'll pan out.