If i buy a xbox game of microsoft does it give me a code to redeem if not what is it then

Of course, all you have to do is go to https://www.xbox.com/en-us/games and search for the game you want.

Yes. That can be considered marketplace theft and put you at risk for being banned.

If you're in the US, choose United States. If you're in Australia, choose Australia.

But can i buy it off the website not off the xbox

Does it matter if i chose the one i am not because the united states is the cheapest one but Australia is more expensive