Should I buy crypto with low or high market cap?

Hello there, I'm curious about something related to cryptocurrency investments. I've been hearing a lot about the market cap of different cryptos and how it can affect the decision to buy or not. So, my question is: should I be focusing on cryptos with a low market cap or go for those with a higher one? I understand that both have their pros and cons, but I'm looking for some guidance on which might be a more suitable option for a beginner investor like myself. Could you please shed some light on this matter?