You need the internet to play games online on your Xbox One, but most Xbox One games don't necessarily require an internet connection.
How to Go Online on Xbox?
How to Use Xbox Game Pass Ultimate on a Meta Quest Headset
Xbox Remote Play
you need wifi to play story mode nowđź‘Ť i own story mode but rockstar can't confirm it because i'm not connected to wifi, great job. : r/GTAV
Can You Play Microsoft Pc Games On Xbox One?
How to play Xbox Series XS games on Xbox One - GameRevolution
Can you play Xbox 360 games on Xbox One? The console's backwards compatibility explained
Don't Forget, Starfield Is Playable On Xbox One With Game Pass Ultimate
Do You Need Xbox Live to Play Fortnite?
Do You Need To Be Online To Play Xbox Series S Games? & How To Play Titles Offline / Disconnected
Do I need Xbox Live to play CoD Black Ops (the first one for the 360) couch co-op, split screen, offline, on my Xbox Series S? : r/xbox
Xbox Play Anywhere coming 13 September: here's what you need to know