you can buy coin exchange with large capitalization market like binance coin,huobi token or okb from okex.
but there are still many exchange token out there but i wouln't recomended that because to risky choose another token than i mentioned earlier.
Choosing strong coin is best decision. Those exchange coin will give good return and the risk to lost value is little since those exchanges are being use and many token are listed on it. I agree that if your going to invest in altcoin, invest on exchange token, which is popular to the trader because it will always standout on the market. Binance exchange s one of the trusted exchange all through out it is launch.