This was one of my first sewing projects and it was really easy and I love it.
You need to cut out two hearts out of pieces of material. The back piece here was just white. I used pinking shears to get the zig zag outline. Before sewing them together I hand sewed the buttons on the front piece. Then using a needle and thread, hand sew with a simple stitch all the way around leaving a gap of about an inch. Then stuff the heart with some wadding and once you get the shape you want, finish off and close up the gap !
Then sew a little piece of ribbon on the hang it up :)