Xbox 360 games on Xbox One?

Hi

I wanted to know if you can play Xbox 360 games on Xbox One and what should you watch out for when buying games?

Yes you can play some games from the 360 to the one. This is also called downward compatible. But you can't play all games from the 360 on the one. Just write "Xbox one downward compatible list" on Google and you will see which 360 games you can play or which are backward compatible.