The current cryptocurrency market is highly volatile. Buying any altcoin at this time is a little risky. Because I think the altcoin season is almost ups and down . However, if you want to buy Altcoin, you can notice the 24 hours trading volume of that Altcoin, you can notice that Altcoin ATH. If you really buying altcoins for short term meaning you want to gain profits for short period of time you need to learn how to trade. Observation must be focused on the project. Then you can buy coins at a convenient price.