I have a tough question:
I have Minecraft on the iPad and would like to play it on the laptop, but there it costs again, I have an xbox live account.
but I can't log in to the laptop and all that. And I wanted to ask because I play Minecraft and then I have a Mojang account, right?
and what do I do to play Minecraft on the laptop? Do I have to register from scratch and all that?
You have to buy it again.
If you have an Android device, you can install an Android emulator and use it to log into the Play Store. I think there are only paid emulators for iOS.