With these current market low performance then it is natural that mostly will be in confused but if you will just choose the best and high ranked Altcoins then for sure you will be at ease. Buy Ethereum as it was the most trusted Altcoins and it is the most commonly used platform by most ICO. Do not buy some cheap coins that belong in the lowest ranks as there is a change that these coins will become crap losing your investment in the future. Visit this site for your coins complete reference https://coinmarketcap.com