Can you play on two devices with one Minecraft account?
Yes, you just have to sign in on the other device
Yes you can. But you can't, for example, on a server. (So with 2 devices and one account)
The two accounts can then already be on the server, but they can't be on the same server
Yes on what web
Simply on the Minecraft page
Yes, that's what I meant. Was a bit poorly worded.
Oh xD