go to coinmarketcap, see list 1 to 20 and choose, because top 10 alt for investment is there. but you should do more research, before investing.
I do not agree with you. The top 20 coins in coinmarketcap usually have a very high price, when we invest the coins it is very rare to make a lot of money. I think it is advisable to invest coins in the top 200-300