Fill in the blanks with whatever it is that you shed blood, sweat & tears over.
I really felt like I had arrived when I could finally cook an egg just about anyway there is to cook it. Well, that is not entirely true...depends on the mood of my old black iron skillet. (yeah right)
Maybe you graduated from a fine cooking academy...maybe you can make some dish that took years to perfect.
Or maybe you finally made a dish that dear spouse's Mama would approve. If you did, you move right up to the front of the line in this discussion. Anyone that can please a cranky/picky/critical eater deserves first chance at bragging rights.