Hey Goody..
It will cost you less than $100 dollars to learn how to do it, hardware and training...
Always small sums to test first...
Then the big ones they can get, $99 per transaction is common with cloned cards. (tap and go)
What ever they can get, with direct account access.
Thats why they do it, easy to do, and hardly any chance on getting caught - they are that stuff that we flush down the toilet everyday !
When you are curious about tech, love the hunt, you soon learn just how to try to protect your own stuff, and teach your kids too.
Some shops want you to hand them your card to put it thru the machine,
NEVER let it go, dont hand it to them,
you put it through and ALWAYS check the dollar figure before approving the purchase.
Pubs, Clubs, cafes, high tourism and high staff turnover places are the worst -
I have seen card readers mounted
under shop counters in a particular position, thats where they put the card for a few seconds
on top of the counter, and it gets read, then they try the transaction again and it works this time - but they got your card during the stall time.
They just mount the reader with double sided tape and pull it off later.
Even easier is to stand next to you or back to back, some devices can do it over metres away.
LOL - Youtube is worse than prison for teaching thieves, tech demonstrations for all of this.
Goody, you are more aware now, dont worry, you will get your new card, go thru the work of resetting things and
things will settle down.