Yeast Starter Anatomy

I only got into the fun and importance of making yeast starters in the fall last year. I made half batches for so long that one packet of yeast was plenty for 3 gallon high gravity beers. Last night while enjoying the last beer made last year, a Single Hop (Palisade) Pale Ale, a friend found something off about it. Out of no where he asked if I made a starter and I actually didn't. It was the first time I didn't out of 8 or so recipes. So here is my usual set up for making one. Yeast Nutrient optional.