Keeping up with the market definitely helps when investing into altcoins or cryptocurrencies. I looked through many publications and personally I read these ones:
1) Cointelegraph
2) Hacked.com
3) CryptoSlate
4) BitcoinNews
5) CCN
6) Coinspeaker.
Of course, also Twitter and Telegram. What do you guys think? Any recommendations?

I actively use telegram channels. I signed up to the most famous channels about crypto-currencies. It is very convenient when all the news is always at hand in one place. And this is only the beginning. Therefore, I recommend using telegram channels.