Please, consider using Galaxy Score. It's a feature that takes into account various factors and then tells you when to buy, sell or hold. This innovative tool is currently available on CoinDeal. It may be extremely useful to you since you're a newbie. (And it is for me since I'm not so-newbie 
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It is quite interesting thing that galaxy score, hope it will help me a bit someday. Also Coindeal is pretty reliable exchange, good option for newbies, recently I've found ranking TOP 5 trading platforms for EU and CD is on the 1st place: https://cryptomag.me )