first you need to get knowledge of the past and present of any coin you wants to trade. Keep an eye on the market as well as other coins. Whales will do the rest of the things 
other than that if there is a special trick to start trading for beginners, what are the factors triggering the ups and downs of prices? when is the best time to buy or sell? and is there a coin that can be used as a reference up and down the price? thanks . 