Fallout Shelter save files location on Windows 10

According to Bethesda's official Fallout Shelter Updates thread, the ability to skip the tutorial was added in version 1.2:

Are you an experienced Overseer who has already undergone Vault operational training? Now you can skip the tutorial!

When you start a new vault, there is an intro screen congratulating you on being selected as the new overseer. In the upper-right corner of this screen you will find the option to 'skip'. This skips the tutorial.

Here is the screen I'm referring to, pre-patch:

The game will start with the vault entrance, three levels of elevator, and a line of dwellers outside the vault.

Every time you start a new vault, you start with the vault door and elevators alone, you have to go through the tutorials again, and you get the easy objectives that reward lunchboxes again.

If you want to reset a vault, delete it from the vault list in the main menu, and start another vault on top of its save slot. To reset your game, you can delete all of your vaults and start them over.