If you want to save your world, click "Save World" in the pause menu. It downloads a .json file. To load it later, click "Open World" and select that file.
: You can find various community-hosted links on sites like Eaglercraft.com or via repositories on GitHub.
Unlike the 1.8.8 version where the offhand slot is visually absent, the 1.11.2 framework supports holding items in your left hand. This allows players to hold a or a shield while navigating dangerous terrain, massively altering survival strategies. 2. The Exploration Update Content