Sometimes, when you are working with softwood, like pinewood, you can end up with some knot holes. This can be annoying especially when they are visible.
In my case, I had a knot hole on the wardrobe door. I had no choice, I had to come up with a fix.
As you can see in the picture there is quite a big and ugly hole right on the front side of the door.
To fix the issue, you need just a piece o hard wood and some glue. The trick is to cut a piece of hardwood to fit the hole, insert the dowel in the hole and put some glue. Once the glue is dried, cut of the excessive materials with a handsaw and sand flush the surface.
Here is the result, it is quite amazing.