“The story goes on. The tale never ends.”
For those of us who can’t get enough of Geralt of Rivia (better known as The Witcher), Andrzej Sapkowski offers Season of Storms (2013 in Polish, 2018 in English), a stand-alone prequel novel. This would be a fine place to start for WITCHER newbies, though its story is not one of the better ones. I recommend starting with The Last Wish and coming back to Season of Storms once you’ve become a fan.