Some coins serve no utility?

I have recently began investing in crypto again the past couple of months, investing 50-100 every week and i was wondering why so many coins say “serves no utility”. i don’t understand the point of even listing. Also, the names of the coins too i am seeing a lot of “meme” coins or coins that have to do with animals wearing hats or something. I have been inactive the past couple of years and now that i’ve downloaded a few trading platforms again it makes it kind of hard to tell what is it be taken seriously and what is a joke.