And it's best if you do your own thorough research on the coin you are going to choose, and if you are completely new here and want to immediately choose the best coin. If you were to choose only one coin, I would definitely choose Bitcoin and you can buy it when the price of Bitcoin drops and hold it for the long term. And you also use the DCA method to make regular purchases with the amount you have determined every week or month and also for the long term.
And if you want to choose 5 different coins, you still have to choose Bitcoin as well as Ethereum. and other oldest coins that have a good track record, especially in terms of profits.