The iPhone XS and the iPhone XS Max came out in September 2018. The two phones share the same features and specifications except for the size of the screens and the life of the battery. The XS Max has the bigger screen (6.5 inches compared to the XS's 5.8 inches); and better battery life (3174mAh/12.08Wh), thus gaining an advantage over the XS.
This guide is aimed at helping new owners of the iPhone XS and XS Max to better understand and manipulate their new devices.