If that's true, first of al you need to register an account in the exchange that exist buying/selling that coin because not 1 altcoins not listed on entire all exxchange. For example, ETN just listed on Binances, you can access this wwebsite to check.  https://coinmarketcap.com/currencies/electroneum/#markets after that you can browse the way to order in some youtube video acording to the exchange you are in, it really useful. And then you are becoming a amateur trader. Once dept into the exchange you should not deposit all you have because exchange wallet is not secure. And just holding an big enough amount and wait for pump