I have several questions:
- Do you have to have a Facebook / Instagram account?
- Can you see a list of all the games somewhere or where do you get them? Approximately how much does a game cost?
- Do you need a green cordoned off area, or how do you realise that you've run into a wall?

Question

Answer

No, you no longer need a Facebook account. You can search for the games in the Quest Store
 
https://www.meta.com/de-de/experiences/

The glasses scan the room by themselves.

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Question about Meta Quest 3

I have several questions: - Do you have to have a Facebook / Instagram account? - Can you see a list of all the games somewhere or where do you get them? Approximately how much does a game cost? - Do you need a green cordoned off area, or how do you realise that you've run into a wall?