Recently, with the release of Samsung Galaxy Note10/10+ Samsung brought a new feature of Intelligent Wi-Fi Auto Hotspot and Tips. Auto Hotspot offers an easy solution for transforming your Galaxy smartphone into a Wi-Fi hub. After an initial setup, the feature will let your smartphone establish a hotspot automatically with other Samsung devices if they share the same Samsung account or family account. By offering troubleshooting guides and alerts, Wi-Fi Tips ensures your mobile connection will be stable and secure. This feature was rolled out to Galaxy S10 Series with One UI 2 update and should come to other devices as well when One UI 2 is released for them.
Here is a representational video from Samsung, where you can see how this feature works :
