How to undo a crochet stitch

so let’s say you made a mistake and you want to undo a stitch and doing a stitch is super easy all you got to do is pull on the yarn that’s attached to the ball and i just want to show you that when you feel that first pop of give you might notice that your piece looks like it’s got two loops in it and that means you haven’t completely taken the stitch out yet you need to keep on pulling until this second loop disappears then you’re left with only one and that is the working loop that you’re gonna put your hook into so that you can go ahead and redo that stitch