How can I get online free verified certificates?

Without knowing what field your looking to get certificates in, there aren’t many that are actually “verified” certificates. That being said, there are a few places where you can get completion certificates, that is, recognition that you finished the course, not actually taken any certification tests of anything. You can start with edX. They have college courses, some are free, some aren’t. You could also check places like udemy for free courses and get certificate of completion at the end.