I’d recommend checking out this video for an overview on using Monzo abroad -
& have a look at the Monzo in [country name] topic for the country that you’re planning to visit, to see tips from other users about using Monzo there.
Also, it would be great if you could share your user number here (you’ll find it in your profile / setting’s screen) so that we can see how many user’s Monzo’s got to 