What is a good, reliable self publishing company?

Hello. I was wondering what is a good self publishing company that is not a scam and is RELIABLE? I’ve heard rumors about scam companies and would like some suggestions and insights from self published authors and your experiences. I am preferring a company that also includes good marketing and cover design options. Thank you for your help! (Im a 19 year old male in college BTW, interested in creative writing since forever. thanks!)

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