The minus sign (aka the dash) will eliminate unwanted search results. Let’s say you want to see information about a hurricane that was a harbor. If you search “hurricane in harbor” you will get results from the amusement park Six Flags! We don’t want that, so instead we can type: hurricane in harbor -six flags. This will give you results about the weather. Important: always put a space right before the minus, but not after it.
Here is a tutorial on how to do this. https://www.screencast.com/t/FtVHsSoXyE