Xbox game pass membership?

There's currently the xbox gampass ultimate for 1 euro. Unfortunately, I don't know much about it. Can I cancel my order at the end of the month as normal? Or will another contract come about with more costs? What happens to my previous data? Does something change for the ultimate pass?

You have to cancel it or it will continue to run.

For a month it costs 1 euro. After that, an additional 13 euro is deducted for each month. But on the last day of 1 euro gamepass you can cancel it and the 13 will not be deducted from you the next day.