Its a question I'm asking myself right now!

I am selling my house in the UK and thinking of using some of the money to put down a deposit on a place over here. It seems if I put down 20% as the deposit then my monthly payments would be equivalent to what I'm paying in rent so it seems logical to do that. But what I'm having trouble to understand is the mortgage system.

I pay 2 different mortgages? And 1 is a fixed term and 1 isn't? Maybe someone can explain it to me!

Does buying somewhere make sense if potentially I will only be here for a few years?

Cheers!