"People" and "persons" are both technically correct, but you will usually only ever read "persons" in very specific contexts. I don't think I've ever said or written "persons" in my entire life.
You commonly see it in legal contexts, but otherwise it's rarely used ex. "Police are currently searching for missing the persons", "This elevator can hold a maximum of ten persons", "This product is not suitable for persons under eighteen years of age" etc.
Sadly, I've even heard native speakers more than once say "Hey, they spelled 'people' wrong!". That's how uncommon it is.
It's good to recognise "persons" when you see it, but you will never go wrong if you always say "people".