This is a small guide with useful information about some basics mechanic of Die Young (saving, drinking, sleeping, fast travels, etc...). For more details, visit the Game Mechanics page.
In Die Young, there are both automatic or manual savings. When the game is saving, a small icon will appear on the upper-right of the screen.
The game saves automatically every time you complete a quest or use a shelter (see below) using a single slot called "AutoSave". The game also saves in some key moments of the story (in this case usually the game creates new saves with specific names).
To save manually, you have to use Campfires. Campfires are found all around the island. Every time you get close a campfire, a marker will be added to your map. There are two ways to do a manual save using the campfires: quick saving and slots saving. To quick save your game, interact with a campfire pressing and holding the Interaction; if the campfires lights up, it means that you have successfully saved your game (a slot called "QuickSave" will be overwritten every time you use this saving method). To select a specific new slot in which you want to save your game, interact with a campfire using the B-key (or the A-button on a gamepad). This will open a saving menu in which you can chose to create a new slot or overwrite an old one.