How do I save the game?

[Gemo]

Regarding "saving the game" -

On the Load Game screen there are selectons for;
Save Spots -- ***How do I save a game to this menu?***
Auto Saves -- Self explanatory
Favourites -- User can select chosen games to be saved from Auto Saves...

Also - on a screen at the end of the game you see a liine for;
"Save artifacts used"
***What is this for?*** - mine said "2" but I don't know what that refers to and how it should work.