Briefly summarize the what you consider to be the three (3) most important things you learned in this course.

1. Probably the biggest one is that I learned about mySQL ER diagrams. Previously I was designing databases using lucid charts which in hindsight was terrible.

2. I learned that, if needed, I can heavily optimize my SQL queries in my apps. Currently I let ORMs do all the heavy lifting but, they can only do so much with the data that is provided. Queries can be substantially improved if the architect can see the whole picture.

3. The other stuff I learned are really heavy in the details but, the above broad strokes are going to be my main takeaways of this class. I also feel empowered with the ability to act on this knowledge which is nice.