I've played every one of them, so it's second nature for me. A little background..... It's set in a world where we never moved on from the 50's culture. But, technology did "move on" as there are laser and plasma weapons. Also, a lot of robots running around. In Oct 2077, there's a nuclear war. The games are all set about 200 years after that. They involve "Vault dwellers". A company called Vault Tec set up bomb shelters called vaults before the war happened. The games are more about exploring than doing the main quests. It's a very interesting world Bethesda has created. I really like the universe they made, so I really like the games. Hopefully you'll really get into also.