Is it bad for your credit to have cards with small limits on them?

I am trying to improve my credit score and I am just trying to figure out the best way and fastest way to do it. I also was wondering if it looks bad or good on your credit to have cards with small limits like $ 300 or $ 500? That’s the highest limit that I have and was wondering how it is affecting me. Should I close cards with low limits and just not have credit cards at all? HELP!

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