for old altcoin, Eth, tron along with chainlink are best altcoins for investment. Prices are continuously increasing, has sustainability enough to reach high value within this year. Eth has potential to cross up-to $700. Same for tron and chainlink, price around 30cent & $30 respectively. For new altcoins, Defi projects are also consider best for investment but select them carefully prevent scam
Top altcoins like ETH, BNB are always the best choice for investing in. BNB and ETH prices are increasing day by day, no doubt the price will keep increasing. l believe that both of them will reach more than their own ATH price. About exchange, there are really a lot of choices, but it would be better to choose one of them which is most popular among others. BNB, Coinbase can be a good choice, it doesn't matter we are talking about safety or something else. But for me Binance exchange is the best, it depends on your choice. This exchange is already tested by a lot of investors and they are not sad about choosing this exchange.