I think that you should first of all take care of where you will store your coins. To successfully register the official coin purse, if it is a token ERC20, you'll like myetherwallet or metamask. Make a purchase only on proven exchanges, I use Binance, this exchange is one of the best and you will find many different coins on it.
Now there are a lot of proven exchanges, even decentralized exchanges are very popular and convenient now. The most important thing is to figure it out with the choice of a coin, and now it is very difficult to do.