A nice presentation, but which are the most common design patterns? Are those in the article? I would also rank high e.g. Observer. Also some toy real world exa

A nice presentation, but which are the most common design patterns? Are those in the article? I would also rank high e.g. Observer. Also some toy real world examples are common in those sort of presentations for a more complete understanding. In relation to other articles this gives better intuitions on where they are used.