Hello. SLAM is increasingly considered "solved", so some of the major research challenges that a large community has focused on over the past two decades have already been solved. You can see how fairly reliable SLAM systems are becoming consumer products among autonomous vehicles, read more on the site https://dioramslam.com/ .
This technology is used in many robotic applications, but the thread of similarity that runs through them all is the idea of ​​a robot properly moving on its own over a patch of land or water that it has never crossed before. It's also just a lot of grammar for a robot constantly using GPS and a few other algorithms to "learn" unfamiliar terrain while still maintaining a relatively accurate sense of positioning through triangulation.