First time buying a few assets need advice on what to do next.

Just bought 25 dollars of crypto as a start off doing a bit of research but thought to come here to see if anybody with a lot more experience than me could help out. Just need to know where to start. Here are some of the assets I've put money into polygon $20, XRP 5$ I'm not really sure where to start like I said I've done some research, but I just keep finding videos of people saying you have to have thousands of dollars to start which I know isn't true lol. I also am using Coinbase as of now because I don't know that many other apps for mobile to start on besides these few Coinbase, Webull,Coinmarketcap,Robinhood.