The paradas method is a way to play the accordion that involves squeezing the bellows (the part that makes noise) at certain times.
Think of the accordion like a sandwich that you can move back and forth to make noise. When you squeeze the sandwich together (push the bellows), you make a sound. When you let it go (pull the bellows), you also make a sound.
Now, with the paradas method, you use your fingers to block and unblock some of the holes on the accordion while you squeeze and release the sandwich. When you block the holes, the sound changes and when you unblock them, the sound changes again.
It's like playing peek-a-boo with the sandwich - you cover and uncover parts of it to create different sounds.
So, when someone is using the paradas method, they are controlling the different sounds that the accordion makes by squeezing and un-squeezing it while blocking and unblocking parts of it with their fingers. It takes some practice, but it can be a really cool way to play music!