Design is much more than a slick visual presentation. It's really a process for creatively solving your business problems. User-centered design helps the people buying and using your software feel confident that what you make will meet their needs.
There are logical, repeatable concepts that can be applied universally to better solve problems. Just like there are laws of physics, design shouldn't be a mysterious black box.
Clipping is a handy way to collect important slides you want to go back to later.