The Constitution (Bill of Rights) specifically lists (enumerates) certain rights which citizens have.
The 9th Amendment simply clarifies that just because these certain rights are listed does not mean that the people don't have other rights which were not listed. Those other rights are "retained" by the people.
What some of those rights are is an interesting discussion . . . What career you chose?, Where you want to live?, How many children you may have?, and so on are easy . . . however, other "rights" have become issues of controversy, including who you marry (thought to be an easy right to agree with until the advent of "same-sex" couples wanting to get married, that made the issue of "marry who you want" a touch more difficult) . . . also medical decisions regarding your own body - abortion, privacy, end of life assistance if terminally ill, right to refuse treatment, etc. All these assumed rights are problematic to others.
the ninth amendment means that the bill of rights does not out rule other laws because it is written It also means that the we still have the obvious rights we have such as thinking, traveling, or talking that aren't mentioned in the Constitution.